man1/getent.1

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   2 .\" Copyright (c) 2015, Robin H. Johnson <robbat2@gentoo.org>
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  25 .TH GETENT 1 2019-03-06 "Linux" "User Commands"
  26 .SH NAME
  27 getent \- get entries from Name Service Switch libraries
  28 .SH SYNOPSIS
  29 .B getent\ [\fIoption\fP]...\ \fIdatabase\fP\ \fIkey\fP...
  30 .SH DESCRIPTION
  31 The
  32 .B getent
  33 command displays entries from databases supported by the
  34 Name Service Switch libraries,
  35 which are configured in
  36 .IR /etc/nsswitch.conf .
  37 If one or more
  38 .I key
  39 arguments are provided,
  40 then only the entries that match the supplied keys will be displayed.
  41 Otherwise, if no
  42 .I key
  43 is provided, all entries will be displayed (unless the database does not
  44 support enumeration).
  45 .PP
  46 The
  47 .I database
  48 may be any of those supported by the GNU C Library, listed below:
  49 .RS 3
  50 .TP 10
  51 .B ahosts
  52 When no
  53 .I key
  54 is provided, use
  55 .BR sethostent (3),
  56 .BR gethostent (3),
  57 and
  58 .BR endhostent (3)
  59 to enumerate the hosts database.
  60 This is identical to using
  61 .BR hosts .
  62 When one or more
  63 .I key
  64 arguments are provided, pass each
  65 .I key
  66 in succession to
  67 .BR getaddrinfo (3)
  68 with the address family
  69 .BR AF_UNSPEC ,
  70 enumerating each socket address structure returned.
  71 .TP
  72 .B ahostsv4
  73 Same as
  74 .BR ahosts ,
  75 but use the address family
  76 .BR AF_INET .
  77 .TP
  78 .B ahostsv6
  79 Same as
  80 .BR ahosts ,
  81 but use the address family
  82 .BR AF_INET6 .
  83 The call to
  84 .BR getaddrinfo (3)
  85 in this case includes the
  86 .B AI_V4MAPPED
  87 flag.
  88 .TP
  89 .B aliases
  90 When no
  91 .I key
  92 is provided, use
  93 .BR setaliasent (3),
  94 .BR getaliasent (3),
  95 and
  96 .BR endaliasent (3)
  97 to enumerate the aliases database.
  98 When one or more
  99 .I key
 100 arguments are provided, pass each
 101 .I key
 102 in succession to
 103 .BR getaliasbyname (3)
 104 and display the result.
 105 .TP
 106 .B ethers
 107 When one or more
 108 .I key
 109 arguments are provided, pass each
 110 .I key
 111 in succession to
 112 .BR ether_aton (3)
 113 and
 114 .BR ether_hostton (3)
 115 until a result is obtained, and display the result.
 116 Enumeration is not supported on
 117 .BR ethers ,
 118 so a
 119 .I key
 120 must be provided.
 121 .TP
 122 .B group
 123 When no
 124 .I key
 125 is provided, use
 126 .BR setgrent (3),
 127 .BR getgrent (3),
 128 and
 129 .BR endgrent (3)
 130 to enumerate the group database.
 131 When one or more
 132 .I key
 133 arguments are provided, pass each numeric
 134 .I key
 135 to
 136 .BR getgrgid (3)
 137 and each nonnumeric
 138 .I key
 139 to
 140 .BR getgrnam (3)
 141 and display the result.
 142 .TP
 143 .B gshadow
 144 When no
 145 .I key
 146 is provided, use
 147 .BR setsgent (3),
 148 .BR getsgent (3),
 149 and
 150 .BR endsgent (3)
 151 to enumerate the gshadow database.
 152 When one or more
 153 .I key
 154 arguments are provided, pass each
 155 .I key
 156 in succession to
 157 .BR getsgnam (3)
 158 and display the result.
 159 .TP
 160 .B hosts
 161 When no
 162 .I key
 163 is provided, use
 164 .BR sethostent (3),
 165 .BR gethostent (3),
 166 and
 167 .BR endhostent (3)
 168 to enumerate the hosts database.
 169 When one or more
 170 .I key
 171 arguments are provided, pass each
 172 .I key
 173 to
 174 .BR gethostbyaddr (3)
 175 or
 176 .BR gethostbyname2 (3),
 177 depending on whether a call to
 178 .BR inet_pton (3)
 179 indicates that the
 180 .I key
 181 is an IPv6 or IPv4 address or not, and display the result.
 182 .TP
 183 .B initgroups
 184 When one or more
 185 .I key
 186 arguments are provided, pass each
 187 .I key
 188 in succession to
 189 .BR getgrouplist (3)
 190 and display the result.
 191 Enumeration is not supported on
 192 .BR initgroups ,
 193 so a
 194 .I key
 195 must be provided.
 196 .TP
 197 .B netgroup
 198 When one
 199 .I key
 200 is provided, pass the
 201 .I key
 202 to
 203 .BR setnetgrent (3)
 204 and, using
 205 .BR getnetgrent (3)
 206 display the resulting string triple
 207 .RI ( hostname ", " username ", " domainname ).
 208 Alternatively, three
 209 .I keys
 210 may be provided, which are interpreted as the
 211 .IR hostname ,
 212 .I username
 213 and
 214 .I domainname
 215 to match to a netgroup name via
 216 .BR innetgr (3).
 217 Enumeration is not supported on
 218 .BR netgroup ,
 219 so either one or three
 220 .I keys
 221 must be provided.
 222 .TP
 223 .B networks
 224 When no
 225 .I key
 226 is provided, use
 227 .BR setnetent (3),
 228 .BR getnetent (3),
 229 and
 230 .BR endnetent (3)
 231 to enumerate the networks database.
 232 When one or more
 233 .I key
 234 arguments are provided, pass each numeric
 235 .I key
 236 to
 237 .BR getnetbyaddr (3)
 238 and each nonnumeric
 239 .I key
 240 to
 241 .BR getnetbyname (3)
 242 and display the result.
 243 .TP
 244 .B passwd
 245 When no
 246 .I key
 247 is provided, use
 248 .BR setpwent (3),
 249 .BR getpwent (3),
 250 and
 251 .BR endpwent (3)
 252 to enumerate the passwd database.
 253 When one or more
 254 .I key
 255 arguments are provided, pass each numeric
 256 .I key
 257 to
 258 .BR getpwuid (3)
 259 and each nonnumeric
 260 .I key
 261 to
 262 .BR getpwnam (3)
 263 and display the result.
 264 .TP
 265 .B protocols
 266 When no
 267 .I key
 268 is provided, use
 269 .BR setprotoent (3),
 270 .BR getprotoent (3),
 271 and
 272 .BR endprotoent (3)
 273 to enumerate the protocols database.
 274 When one or more
 275 .I key
 276 arguments are provided, pass each numeric
 277 .I key
 278 to
 279 .BR getprotobynumber (3)
 280 and each nonnumeric
 281 .I key
 282 to
 283 .BR getprotobyname (3)
 284 and display the result.
 285 .TP
 286 .B rpc
 287 When no
 288 .I key
 289 is provided, use
 290 .BR setrpcent (3),
 291 .BR getrpcent (3),
 292 and
 293 .BR endrpcent (3)
 294 to enumerate the rpc database.
 295 When one or more
 296 .I key
 297 arguments are provided, pass each numeric
 298 .I key
 299 to
 300 .BR getrpcbynumber (3)
 301 and each nonnumeric
 302 .I key
 303 to
 304 .BR getrpcbyname (3)
 305 and display the result.
 306 .TP
 307 .B services
 308 When no
 309 .I key
 310 is provided, use
 311 .BR setservent (3),
 312 .BR getservent (3),
 313 and
 314 .BR endservent (3)
 315 to enumerate the services database.
 316 When one or more
 317 .I key
 318 arguments are provided, pass each numeric
 319 .I key
 320 to
 321 .BR getservbynumber (3)
 322 and each nonnumeric
 323 .I key
 324 to
 325 .BR getservbyname (3)
 326 and display the result.
 327 .TP
 328 .B shadow
 329 When no
 330 .I key
 331 is provided, use
 332 .BR setspent (3),
 333 .BR getspent (3),
 334 and
 335 .BR endspent (3)
 336 to enumerate the shadow database.
 337 When one or more
 338 .I key
 339 arguments are provided, pass each
 340 .I key
 341 in succession to
 342 .BR getspnam (3)
 343 and display the result.
 344 .RE
 345 .SH OPTIONS
 346 .TP
 347 .BR \-s\ \fIservice\fP ", " \-\-service\ \fIservice\fP
 348 .\" commit 9d0881aa76b399e6a025c5cf44bebe2ae0efa8af (glibc)
 349 Override all databases with the specified service.
 350 (Since glibc 2.2.5.)
 351 .TP
 352 .BR \-s\ \fIdatabase\fP:\fIservice\fP ", "\
 353 \-\-service\ \fIdatabase\fP:\fIservice\fP
 354 .\" commit b4f6f4be85d32b9c03361c38376e36f08100e3e8 (glibc)
 355 Override only specified databases with the specified service.
 356 The option may be used multiple times,
 357 but only the last service for each database will be used.
 358 (Since glibc 2.4.)
 359 .TP
 360 .BR \-i ", " \-\-no\-idn
 361 .\" commit a160f8d808cf8020b13bd0ef4a9eaf3c11f964ad (glibc)
 362 Disables IDN encoding in lookups for
 363 .BR ahosts / getaddrinfo (3)
 364 (Since glibc-2.13.)
 365 .TP
 366 .BR \-? ", " \-\-help
 367 Print a usage summary and exit.
 368 .TP
 369 .B "\-\-usage"
 370 Print a short usage summary and exit.
 371 .TP
 372 .BR \-V ", " \-\-version
 373 Print the version number, license, and disclaimer of warranty for
 374 .BR getent .
 375 .SH EXIT STATUS
 376 One of the following exit values can be returned by
 377 .BR getent :
 378 .RS 3
 379 .TP 10
 380 .B 0
 381 Command completed successfully.
 382 .TP
 383 .B 1
 384 Missing arguments, or
 385 .I database
 386 unknown.
 387 .TP
 388 .B 2
 389 One or more supplied
 390 .I key
 391 could not be found in the
 392 .IR database .
 393 .TP
 394 .B 3
 395 Enumeration not supported on this
 396 .IR database .
 397 .RE
 398 .SH SEE ALSO
 399 .BR nsswitch.conf (5)