man/systemctl.xml

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   8   Copyright 2010 Lennart Poettering
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  23
  24 <refentry id="systemctl">
  25
  26         <refentryinfo>
  27                 <title>systemctl</title>
  28                 <productname>systemd</productname>
  29
  30                 <authorgroup>
  31                         <author>
  32                                 <contrib>Developer</contrib>
  33                                 <firstname>Lennart</firstname>
  34                                 <surname>Poettering</surname>
  35                                 <email>lennart@poettering.net</email>
  36                         </author>
  37                 </authorgroup>
  38         </refentryinfo>
  39
  40         <refmeta>
  41                 <refentrytitle>systemctl</refentrytitle>
  42                 <manvolnum>1</manvolnum>
  43         </refmeta>
  44
  45         <refnamediv>
  46                 <refname>systemctl</refname>
  47                 <refpurpose>Control the systemd system and session manager</refpurpose>
  48         </refnamediv>
  49
  50         <refsynopsisdiv>
  51                 <cmdsynopsis>
  52                         <command>systemctl <arg choice="opt" rep="repeat">OPTIONS</arg> <arg choice="req">COMMAND</arg> <arg choice="opt" rep="repeat">NAME</arg></command>
  53                 </cmdsynopsis>
  54         </refsynopsisdiv>
  55
  56         <refsect1>
  57                 <title>Description</title>
  58
  59                 <para><command>systemctl</command> may be used to
  60                 introspect and control the state of the
  61                 <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
  62                 system and session manager.</para>
  63         </refsect1>
  64
  65         <refsect1>
  66                 <title>Options</title>
  67
  68                 <para>The following options are understood:</para>
  69
  70                 <variablelist>
  71                         <varlistentry>
  72                                 <term><option>--help</option></term>
  73                                 <term><option>-h</option></term>
  74
  75                                 <listitem><para>Prints a short help
  76                                 text and exits.</para></listitem>
  77                         </varlistentry>
  78
  79                         <varlistentry>
  80                                 <term><option>--type=</option></term>
  81                                 <term><option>-t</option></term>
  82
  83                                 <listitem><para>When listing units,
  84                                 limit display to certain unit
  85                                 types. If not specified units of all
  86                                 types will be shown. The argument
  87                                 should be a unit type name such as
  88                                 <option>service</option>,
  89                                 <option>socket</option> and
  90                                 similar.</para></listitem>
  91                         </varlistentry>
  92
  93                         <varlistentry>
  94                                 <term><option>--property=</option></term>
  95                                 <term><option>-p</option></term>
  96
  97                                 <listitem><para>When showing
  98                                 unit/job/manager information, limit
  99                                 display to certain properties as
 100                                 specified as argument. If not
 101                                 specified all set properties are
 102                                 shown. The argument should be a
 103                                 property name, such as
 104                                 <literal>MainPID</literal>. If
 105                                 specified more than once all
 106                                 properties with the specified names
 107                                 are shown.</para></listitem>
 108                         </varlistentry>
 109
 110                         <varlistentry>
 111                                 <term><option>--all</option></term>
 112                                 <term><option>-a</option></term>
 113
 114                                 <listitem><para>When listing units,
 115                                 show all units, regardless of their
 116                                 state, including inactive units. When
 117                                 showing unit/job/manager information,
 118                                 show all properties regardless whether
 119                                 they are set or not.</para></listitem>
 120                         </varlistentry>
 121
 122                         <varlistentry>
 123                                 <term><option>--full</option></term>
 124
 125                                 <listitem><para>Do not ellipsize unit
 126                                 names in the output of
 127                                 <command>list-units</command> and
 128                                 <command>list-jobs</command>.</para></listitem>
 129                         </varlistentry>
 130
 131                         <varlistentry>
 132                                 <term><option>--fail</option></term>
 133
 134                                 <listitem><para>If the requested
 135                                 operation conflicts with a pending
 136                                 unfinished job, fail the command. If
 137                                 this is not specified the requested
 138                                 operation will replace the pending job,
 139                                 if necessary.</para></listitem>
 140                         </varlistentry>
 141
 142                         <varlistentry>
 143                                 <term><option>--quiet</option></term>
 144                                 <term><option>-q</option></term>
 145
 146                                 <listitem><para>Suppress output to
 147                                 STDOUT in
 148                                 <command>snapshot</command>,
 149                                 <command>check</command>,
 150                                 <command>enable</command> and
 151                                 <command>disable</command>.</para></listitem>
 152                         </varlistentry>
 153
 154                         <varlistentry>
 155                                 <term><option>--no-block</option></term>
 156
 157                                 <listitem><para>Do not synchronously wait for
 158                                 the requested operation to finish. If this is
 159                                 not specified the job will be verified,
 160                                 enqueued and <command>systemctl</command> will
 161                                 wait until it is completed. By passing this
 162                                 argument it is only verified and
 163                                 enqueued.</para></listitem> </varlistentry>
 164
 165                         <varlistentry>
 166                                 <term><option>--system</option></term>
 167
 168                                 <listitem><para>Talk to the systemd
 169                                 system manager. (Default)</para></listitem>
 170                         </varlistentry>
 171
 172                         <varlistentry>
 173                                 <term><option>--session</option></term>
 174
 175                                 <listitem><para>Talk to the systemd
 176                                 session manager of the calling user.</para></listitem>
 177                         </varlistentry>
 178
 179                         <varlistentry>
 180                                 <term><option>--order</option></term>
 181                                 <term><option>--require</option></term>
 182
 183                                 <listitem><para>When used in
 184                                 conjunction with the
 185                                 <command>dot</command> command (see
 186                                 below), selects which dependencies are
 187                                 shown in the dependency graph. If
 188                                 <option>--order</option> is passed
 189                                 only dependencies of type
 190                                 <varname>After=</varname> or
 191                                 <varname>Before=</varname> are
 192                                 shown. If <option>--require</option>
 193                                 is passed only dependencies of type
 194                                 <varname>Requires=</varname>,
 195                                 <varname>RequiresOverridable=</varname>,
 196                                 <varname>Requisite=</varname>,
 197                                 <varname>RequisiteOverridable=</varname>,
 198                                 <varname>Wants=</varname> and
 199                                 <varname>Conflicts=</varname> are
 200                                 shown. If neither is passed, shows
 201                                 dependencies of all these
 202                                 types.</para></listitem>
 203                         </varlistentry>
 204
 205                         <varlistentry>
 206                                 <term><option>--no-wall</option></term>
 207
 208                                 <listitem><para>Don't send wall
 209                                 message before
 210                                 halt, power-off, reboot.</para></listitem>
 211                         </varlistentry>
 212
 213                         <varlistentry>
 214                                 <term><option>--global</option></term>
 215
 216                                 <listitem><para>When used with
 217                                 <command>enable</command> and
 218                                 <command>disable</command>, operate on the
 219                                 global session configuŕation
 220                                 directory, thus enabling or disabling
 221                                 a unit file globally for all future
 222                                 sessions of all users.</para></listitem>
 223                         </varlistentry>
 224
 225                         <varlistentry>
 226                                 <term><option>--no-reload</option></term>
 227
 228                                 <listitem><para>When used with
 229                                 <command>enable</command> and
 230                                 <command>disable</command>, do not
 231                                 implicitly reload daemon configuration
 232                                 after executing the
 233                                 changes.</para></listitem>
 234                         </varlistentry>
 235
 236                         <varlistentry>
 237                                 <term><option>--force</option></term>
 238
 239                                 <listitem><para>When used with
 240                                 <command>enable</command>, override any
 241                                 existing conflicting
 242                                 symlinks.</para></listitem>
 243                         </varlistentry>
 244
 245                         <varlistentry>
 246                                 <term><option>--defaults</option></term>
 247
 248                                 <listitem><para>When used with
 249                                 <command>disable</command>, ensures
 250                                 that only the symlinks created by
 251                                 <command>enable</command> are removed,
 252                                 not all symlinks pointing to the unit
 253                                 file that shall be
 254                                 disabled.</para></listitem>
 255                         </varlistentry>
 256                 </variablelist>
 257
 258                 <para>The following commands are understood:</para>
 259
 260                 <variablelist>
 261                         <varlistentry>
 262                                 <term><command>list-units</command></term>
 263
 264                                 <listitem><para>List known units.</para></listitem>
 265                         </varlistentry>
 266                         <varlistentry>
 267                                 <term><command>start [NAME...]</command></term>
 268
 269                                 <listitem><para>Start (activate) one
 270                                 or more units specified on the command
 271                                 line.</para></listitem>
 272                         </varlistentry>
 273                         <varlistentry>
 274                                 <term><command>stop [NAME...]</command></term>
 275
 276                                 <listitem><para>Stop (deactivate) one
 277                                 or more units specified on the command
 278                                 line.</para></listitem>
 279                         </varlistentry>
 280                         <varlistentry>
 281                                 <term><command>reload [NAME...]</command></term>
 282
 283                                 <listitem><para>Asks all units listed
 284                                 on the command line to reload their
 285                                 configuration. Note that this will
 286                                 reload the service-specific
 287                                 configuration, not the unit
 288                                 configuration file of systemd. If you
 289                                 want systemd to reload the
 290                                 configuration file of a unit use the
 291                                 <command>daemon-reload</command>
 292                                 command. In other words: for the
 293                                 example case of Apache, this will
 294                                 reload Apache's
 295                                 <filename>httpd.conf</filename> in the
 296                                 web server, not the
 297                                 <filename>apache.service</filename>
 298                                 systemd unit file. </para>
 299
 300                                 <para>This command should not be
 301                                 confused with the
 302                                 <command>daemon-reload</command> or
 303                                 <command>load</command>
 304                                 commands.</para></listitem>
 305
 306                         </varlistentry>
 307                         <varlistentry>
 308                                 <term><command>restart [NAME...]</command></term>
 309
 310                                 <listitem><para>Restart one or more
 311                                 units specified on the command
 312                                 line. If the units are not running yet
 313                                 they will be
 314                                 started.</para></listitem>
 315                         </varlistentry>
 316                         <varlistentry>
 317                                 <term><command>try-restart [NAME...]</command></term>
 318
 319                                 <listitem><para>Restart one or more
 320                                 units specified on the command
 321                                 line. If the units are not running yet
 322                                 the operation will
 323                                 fail.</para></listitem>
 324                         </varlistentry>
 325                         <varlistentry>
 326                                 <term><command>reload-or-restart [NAME...]</command></term>
 327                                 <term><command>reload-or-try-restart [NAME...]</command></term>
 328
 329                                 <listitem><para>Reload one or more
 330                                 units if they support it. If not,
 331                                 restart them instead. Note that for
 332                                 compatibility with SysV and Red Hat
 333                                 init scripts
 334                                 <command>force-reload</command> and
 335                                 <command>condrestart</command> may be
 336                                 used as equivalent commands to
 337                                 <command>reload-or-try-restart</command>.</para></listitem>
 338                         </varlistentry>
 339                         <varlistentry>
 340                                 <term><command>isolate [NAME]</command></term>
 341
 342                                 <listitem><para>Start the unit
 343                                 specified on the command line and its
 344                                 dependencies and stop all
 345                                 others.</para></listitem>
 346                         </varlistentry>
 347                         <varlistentry>
 348                                 <term><command>is-active [NAME...]</command></term>
 349
 350                                 <listitem><para>Check whether any of
 351                                 the specified units is active
 352                                 (i.e. running). Returns an exit code
 353                                 0 if at least one is active, non-zero
 354                                 otherwise. Unless
 355                                 <option>--quiet</option> is specified
 356                                 this will also print the current unit
 357                                 state to STDOUT.</para></listitem>
 358                         </varlistentry>
 359                         <varlistentry>
 360                                 <term><command>status [NAME...]</command></term>
 361
 362                                 <listitem><para>Show terse runtime
 363                                 status information about one or more
 364                                 units. This function is intended to
 365                                 generate human-readable output. If you
 366                                 are looking for computer-parsable
 367                                 output, use <command>show</command>
 368                                 instead.</para></listitem>
 369                         </varlistentry>
 370                         <varlistentry>
 371                                 <term><command>show [NAME...|JOB...]</command></term>
 372
 373                                 <listitem><para>Show properties of one
 374                                 or more units, jobs or the manager
 375                                 itself. If no argument is specified
 376                                 properties of the manager will be
 377                                 shown. If a unit name is specified
 378                                 properties of the unit is shown, and
 379                                 if a job id is specified properties of
 380                                 the job is shown. By default, empty
 381                                 properties are suppressed. Use
 382                                 <option>--all</option> to show those
 383                                 too. To select specific properties to
 384                                 show use
 385                                 <option>--property=</option>. This
 386                                 command is intended to be used
 387                                 whenever computer-parsable output is
 388                                 required. Use
 389                                 <command>status</command> if you are
 390                                 looking for formatted human-readable
 391                                 output.</para></listitem>
 392                         </varlistentry>
 393
 394                         <varlistentry>
 395                                 <term><command>reset-maintenance [NAME...]</command></term>
 396
 397                                 <listitem><para>Reset maintenance
 398                                 state of the specified units, or if no
 399                                 unit name is passed of all units. When
 400                                 a unit fails in some way (i.e. process
 401                                 exiting with non-zero error code,
 402                                 terminating abnormally or timing out)
 403                                 it will automatically enter
 404                                 maintenance state and its exit codes
 405                                 and status is recorded for
 406                                 introspection by the administrator
 407                                 until the service is restarted or
 408                                 reset with this
 409                                 command.</para></listitem>
 410                         </varlistentry>
 411
 412                         <varlistentry>
 413                                 <term><command>enable [NAME...]</command></term>
 414
 415                                 <listitem><para>Enable one or more
 416                                 unit files, as specified on the
 417                                 command line. This will create a
 418                                 number of symlinks as encoded in the
 419                                 <literal>[Install]</literal> sections
 420                                 of the unit files. After the symlinks
 421                                 have been created the systemd
 422                                 configuration is reloaded (in a way
 423                                 that is equivalent to
 424                                 <command>daemon-reload</command>) to
 425                                 ensure the changes are taken into
 426                                 account immediately. Note that this
 427                                 does not have the effect that any of
 428                                 the units enabled are also started at
 429                                 the same time. If this is desired a
 430                                 seperate <command>start</command>
 431                                 command must be invoked for the
 432                                 unit.</para>
 433
 434                                 <para>This command will
 435                                 print the actions executed. This
 436                                 output may be suppressed by passing
 437                                 <option>--quiet</option>.</para>
 438
 439                                 <para>Note that this operation creates
 440                                 only the suggested symlinks for the
 441                                 units. While this command is the
 442                                 recommended way to manipulate the unit
 443                                 configuration directory, the
 444                                 administrator is free to make
 445                                 additional changes manually, by
 446                                 placing or removing symlinks in the
 447                                 directory. This is particular useful
 448                                 to create configurations that deviate
 449                                 from the suggested default
 450                                 installation. In this case the
 451                                 administrator must make sure to invoke
 452                                 <command>daemon-reload</command>
 453                                 manually as necessary, to ensure his
 454                                 changes are taken into account.</para>
 455
 456                                 <para>Enabling units should not be
 457                                 confused with starting (activating)
 458                                 units, as done by the
 459                                 <command>start</command>
 460                                 command. Enabling and starting units
 461                                 is orthogonal: units may be enabled
 462                                 without being started and started
 463                                 without being enabled. Enabling simply
 464                                 hooks the unit into various suggested
 465                                 places (for example, so that the unit
 466                                 is automatically started on boot or
 467                                 when a particular kind of hardware is
 468                                 plugged in). Starting actually spawns
 469                                 the daemon process (in case of service
 470                                 units), or binds the socket (in case
 471                                 of socket units), and so
 472                                 on.</para>
 473
 474                                 <para>Depending on whether
 475                                 <option>--system</option>,
 476                                 <option>--session</option> or
 477                                 <option>--global</option> is specified
 478                                 this enables the unit for the system,
 479                                 for sessions of the calling user only
 480                                 or for all future session of all
 481                                 users. Note that in the latter case no
 482                                 systemd daemon configuration is
 483                                 reloaded.</para>
 484                                 </listitem>
 485                         </varlistentry>
 486
 487                         <varlistentry>
 488                                 <term><command>disable [NAME...]</command></term>
 489
 490                                 <listitem><para>Disables one or more
 491                                 units. This removes all symlinks to
 492                                 the specified unit files from the unit
 493                                 configuration directory, and hence
 494                                 undoes the changes made by
 495                                 <command>enable</command>. Note
 496                                 however that this by default removes
 497                                 all symlinks to the unit files
 498                                 (i.e. including manual additions), not
 499                                 just those actually created by
 500                                 <command>enable</command>. If only the
 501                                 symlinks that are suggested by default
 502                                 shall be removed, pass
 503                                 <option>--defaults</option>. This
 504                                 implicitly reloads the systemd daemon
 505                                 configuration after completing the
 506                                 disabling of the units. Note that this
 507                                 command does not implicitly stop the
 508                                 units that is being disabled. If this
 509                                 is desired an additional
 510                                 <command>stop</command>command should
 511                                 be executed afterwards.</para>
 512
 513                                 <para>This command will print the
 514                                 actions executed. This output may be
 515                                 suppressed by passing
 516                                 <option>--quiet</option>.</para>
 517                                 </listitem>
 518
 519                                 <para>This command honours
 520                                 <option>--system</option>,
 521                                 <option>--session</option>,
 522                                 <option>--global</option> in a similar
 523                                 way as
 524                                 <command>enable</command>.</para>
 525                         </varlistentry>
 526
 527                         <varlistentry>
 528                                 <term><command>is-enabled [NAME...]</command></term>
 529
 530                                 <listitem><para>Checks whether any of
 531                                 the specified unit files is enabled
 532                                 (as with
 533                                 <command>enable</command>). Returns an
 534                                 exit code of 0 if at least one is
 535                                 enabled, non-zero
 536                                 otherwise.</para></listitem>
 537                         </varlistentry>
 538
 539                         <varlistentry>
 540                                 <term><command>load [NAME...]</command></term>
 541
 542                                 <listitem><para>Load one or more units
 543                                 specified on the command line. This
 544                                 will simply load their configuration
 545                                 from disk, but not start them. To
 546                                 start them you need to use the
 547                                 <command>start</command> command which
 548                                 will implicitly load a unit that has
 549                                 not been loaded yet. Note that systemd
 550                                 garbage collects loaded units that are
 551                                 not active or referenced by an active
 552                                 unit. This means that units loaded
 553                                 this way will usually not stay loaded
 554                                 for long. Also note that this command
 555                                 cannot be used to reload unit
 556                                 configuration. Use the
 557                                 <command>daemon-reload</command>
 558                                 command for that. All in all, this
 559                                 command is of little use except for
 560                                 debugging.</para>
 561                                 <para>This command should not be
 562                                 confused with the
 563                                 <command>daemon-reload</command> or
 564                                 <command>reload</command>
 565                                 commands.</para></listitem>
 566                         </varlistentry>
 567                         <varlistentry>
 568                                 <term><command>list-jobs</command></term>
 569
 570                                 <listitem><para>List jobs that are in progress.</para></listitem>
 571                         </varlistentry>
 572                         <varlistentry>
 573                                 <term><command>cancel [JOB...]</command></term>
 574
 575                                 <listitem><para>Cancel one or more
 576                                 jobs specified on the command line by
 577                                 their numeric job
 578                                 IDs. If not job id is specified cancels all jobs that are pending.</para></listitem>
 579                         </varlistentry>
 580                         <varlistentry>
 581                                 <term><command>monitor</command></term>
 582
 583                                 <listitem><para>Monitor unit/job
 584                                 changes. This is mostly useful for
 585                                 debugging purposes and prints a line
 586                                 each time systemd loads or unloads a
 587                                 unit configuration file, or a unit
 588                                 property changes.</para></listitem>
 589                         </varlistentry>
 590                         <varlistentry>
 591                                 <term><command>dump</command></term>
 592
 593                                 <listitem><para>Dump server
 594                                 status. This will output a (usually
 595                                 very long) human readable manager
 596                                 status dump. Its format is subject to
 597                                 change without notice and should not
 598                                 be parsed by
 599                                 applications.</para></listitem>
 600                         </varlistentry>
 601                         <varlistentry>
 602                                 <term><command>dot</command></term>
 603
 604                                 <listitem><para>Generate textual
 605                                 dependency graph description in dot
 606                                 format for further processing with the
 607                                 GraphViz
 608                                 <citerefentry><refentrytitle>dot</refentrytitle><manvolnum>1</manvolnum></citerefentry>
 609                                 tool. Use a command line like
 610                                 <command>systemctl dot | dot -Tsvg >
 611                                 systemd.svg</command> to generate a
 612                                 graphical dependency tree. Unless
 613                                 <option>--order</option> or
 614                                 <option>--require</option> is passed
 615                                 the generated graph will show both
 616                                 ordering and requirement
 617                                 dependencies.</para></listitem>
 618                         </varlistentry>
 619                         <varlistentry>
 620                                 <term><command>snapshot [NAME]</command></term>
 621
 622                                 <listitem><para>Create a snapshot. If
 623                                 a snapshot name is specified, the new
 624                                 snapshot will be named after it. If
 625                                 none is specified an automatic
 626                                 snapshot name is generated. In either
 627                                 case, the snapshot name used is
 628                                 printed to STDOUT, unless
 629                                 <option>--quiet</option> is
 630                                 specified.</para>
 631
 632                                 <para>A snapshot refers to a saved
 633                                 state of the systemd manager. It is
 634                                 implemented itself as unit that is
 635                                 generated dynamically with this
 636                                 command and has dependencies on all
 637                                 units active at the time. At a later
 638                                 time the user may return to this state
 639                                 by using the
 640                                 <command>isolate</command> command on
 641                                 the snapshot unit.</para></listitem>
 642
 643                                 <para>Snapshots are only useful for
 644                                 saving and restoring which units are
 645                                 running or are stopped, they do not
 646                                 save/restore any other
 647                                 state. Snapshots are dynamic and lost
 648                                 on reboot.</para>
 649                         </varlistentry>
 650                         <varlistentry>
 651                                 <term><command>delete [NAME...]</command></term>
 652
 653                                 <listitem><para>Remove a snapshot
 654                                 previously created with
 655                                 <command>snapshot</command>.</para></listitem>
 656                         </varlistentry>
 657                         <varlistentry>
 658                                 <term><command>daemon-reload</command></term>
 659
 660                                 <listitem><para>Reload systemd manager
 661                                 configuration. This will reload all
 662                                 unit files and recreate the entire
 663                                 dependency tree. While the daemon is
 664                                 reloaded, all sockets systemd listens
 665                                 on on behalf of user configuration will
 666                                 stay accessible.</para> <para>This
 667                                 command should not be confused with
 668                                 the <command>load</command> or
 669                                 <command>reload</command>
 670                                 commands.</para></listitem>
 671                         </varlistentry>
 672                         <varlistentry>
 673                                 <term><command>daemon-reexec</command></term>
 674
 675                                 <listitem><para>Reexecute the systemd
 676                                 manager. This will serialize the
 677                                 manager state, reexecute the process
 678                                 and deserialize the state again. This
 679                                 command is of little use except for
 680                                 debugging and package
 681                                 upgrades. Sometimes it might be
 682                                 helpful as a heavy-weight
 683                                 <command>daemon-reload</command>. While
 684                                 the daemon is reexecuted all sockets
 685                                 systemd listens on on behalf of user
 686                                 configuration will stay
 687                                 accessible.</para></listitem>
 688                         </varlistentry>
 689                         <varlistentry>
 690                                 <term><command>daemon-exit</command></term>
 691
 692                                 <listitem><para>Ask the systemd
 693                                 manager to quit. This is only
 694                                 supported for session managers
 695                                 (i.e. in conjunction with the
 696                                 <option>--session</option> option) and
 697                                 will fail otherwise.</para></listitem>
 698                         </varlistentry>
 699                         <varlistentry>
 700                                 <term><command>show-environment</command></term>
 701
 702                                 <listitem><para>Dump the systemd
 703                                 manager environment block. The
 704                                 environment block will be dumped in
 705                                 straight-forward form suitable for
 706                                 sourcing into a shell script. This
 707                                 environment block will be passed to
 708                                 all processes the manager
 709                                 spawns.</para></listitem>
 710                         </varlistentry>
 711                         <varlistentry>
 712                                 <term><command>set-environment [NAME=VALUE...]</command></term>
 713
 714                                 <listitem><para>Set one or more
 715                                 systemd manager environment variables,
 716                                 as specified on the command
 717                                 line.</para></listitem>
 718                         </varlistentry>
 719                         <varlistentry>
 720                                 <term><command>unset-environment [NAME...]</command></term>
 721
 722                                 <listitem><para>Unset one or more
 723                                 systemd manager environment
 724                                 variables. If only a variable name is
 725                                 specified it will be removed
 726                                 regardless of its value. If a variable
 727                                 and a value are specified the variable
 728                                 is only removed if it has the
 729                                 specified value.</para></listitem>
 730                         </varlistentry>
 731
 732                         <varlistentry>
 733                                 <term><command>halt</command></term>
 734
 735                                 <listitem><para>Shut down and halt the
 736                                 system. This is mostly equivalent to
 737                                 <command>start halt.target</command>
 738                                 but also prints a wall message to all
 739                                 users.</para></listitem>
 740                         </varlistentry>
 741                         <varlistentry>
 742                                 <term><command>poweroff</command></term>
 743
 744                                 <listitem><para>Shut down and
 745                                 power-off the system. This is mostly
 746                                 equivalent to <command>start
 747                                 poweroff.target</command> but also
 748                                 prints a wall message to all
 749                                 users.</para></listitem>
 750                         </varlistentry>
 751                         <varlistentry>
 752                                 <term><command>reboot</command></term>
 753
 754                                 <listitem><para>Shut down and
 755                                 reboot the system. This is mostly
 756                                 equivalent to <command>start
 757                                 reboot.target</command> but also
 758                                 prints a wall message to all
 759                                 users.</para></listitem>
 760                         </varlistentry>
 761                         <varlistentry>
 762                                 <term><command>default</command></term>
 763
 764                                 <listitem><para>Enter default
 765                                 mode. This is mostly equivalent to
 766                                 <command>start
 767                                 default.target</command>.</para></listitem>
 768                         </varlistentry>
 769                         <varlistentry>
 770                                 <term><command>rescue</command></term>
 771
 772                                 <listitem><para>Enter rescue
 773                                 mode. This is mostly equivalent to
 774                                 <command>isolate
 775                                 rescue.target</command> but also
 776                                 prints a wall message to all
 777                                 users.</para></listitem>
 778                         </varlistentry>
 779                         <varlistentry>
 780                                 <term><command>emergency</command></term>
 781
 782                                 <listitem><para>Enter emergency
 783                                 mode. This is mostly equivalent to
 784                                 <command>isolate
 785                                 emergency.target</command> but also
 786                                 prints a wall message to all
 787                                 users.</para></listitem>
 788                         </varlistentry>
 789                 </variablelist>
 790
 791         </refsect1>
 792
 793         <refsect1>
 794                 <title>Exit status</title>
 795
 796                 <para>On success 0 is returned, a non-zero failure
 797                 code otherwise.</para>
 798         </refsect1>
 799
 800         <refsect1>
 801                 <title>See Also</title>
 802                 <para>
 803                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 804                         <citerefentry><refentrytitle>systemadm</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 805                         <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 806                         <citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
 807                         <citerefentry><refentrytitle>wall</refentrytitle><manvolnum>1</manvolnum></citerefentry>
 808                 </para>
 809         </refsect1>
 810
 811 </refentry>