sys-utils/ipcs.1

   1 .\" Copyright 1993 Rickard E. Faith (faith@cs.unc.edu)
   2 .\" May be distributed under the GNU General Public License
   3 .TH IPCS "1" "July 2014" "util-linux" "User Commands"
   4 .SH NAME
   5 ipcs \- show information on IPC facilities
   6 .SH SYNOPSIS
   7 .B ipcs
   8 [options]
   9 .SH DESCRIPTION
  10 .B ipcs
  11 shows information on the inter-process communication facilities
  12 for which the calling process has read access.
  13 By default it shows information about all three resources:
  14 shared memory segments, message queues, and semaphore arrays.
  15 .SH OPTIONS
  16 .TP
  17 \fB\-i\fR, \fB\-\-id\fR \fIid\fR
  18 Show full details on just the one resource element identified by
  19 .IR id .
  20 This option needs to be combined with one of the three resource options:
  21 .BR \-m ,
  22 .BR \-q " or"
  23 .BR \-s .
  24 .TP
  25 \fB\-h\fR, \fB\-\-help\fR
  26 Display help text and exit.
  27 .TP
  28 \fB\-V\fR, \fB\-\-version\fR
  29 Display version information and exit.
  30 .SS "Resource options"
  31 .TP
  32 \fB\-m\fR, \fB\-\-shmems\fR
  33 Write information about active shared memory segments.
  34 .TP
  35 \fB\-q\fR, \fB\-\-queues\fR
  36 Write information about active message queues.
  37 .TP
  38 \fB\-s\fR, \fB\-\-semaphores\fR
  39 Write information about active semaphore sets.
  40 .TP
  41 \fB\-a\fR, \fB\-\-all\fR
  42 Write information about all three resources (default).
  43 .SS "Output formats"
  44 Of these options only one takes effect: the last one specified.
  45 .TP
  46 \fB\-c\fR, \fB\-\-creator\fR
  47 Show creator and owner.
  48 .TP
  49 \fB\-l\fR, \fB\-\-limits\fR
  50 Show resource limits.
  51 .TP
  52 \fB\-p\fR, \fB\-\-pid\fR
  53 Show PIDs of creator and last operator.
  54 .TP
  55 \fB\-t\fR, \fB\-\-time\fR
  56 Write time information.  The time of the last control operation that changed
  57 the access permissions for all facilities, the time of the last
  58 .BR msgsnd (2)
  59 and
  60 .BR msgrcv (2)
  61 operations on message queues, the time of the last
  62 .BR shmat (2)
  63 and
  64 .BR shmdt (2)
  65 operations on shared memory, and the time of the last
  66 .BR semop (2)
  67 operation on semaphores.
  68 .TP
  69 \fB\-u\fR, \fB\-\-summary\fR
  70 Show status summary.
  71 .SS "Representation"
  72 These affect only the \fB\-l\fR (\fB\-\-limits\fR) option.
  73 .TP
  74 \fB\-b\fR, \fB\-\-bytes\fR
  75 Print sizes in bytes.
  76 .TP
  77 .B \-\-human
  78 Print sizes in human-readable format.
  79 .SH SEE ALSO
  80 .BR ipcmk (1),
  81 .BR ipcrm (1),
  82 .BR msgrcv (2),
  83 .BR msgsnd (2),
  84 .BR semget (2),
  85 .BR semop (2),
  86 .BR shmat (2),
  87 .BR shmdt (2),
  88 .BR shmget (2)
  89 .SH CONFORMING TO
  90 The Linux ipcs utility is not fully compatible to the POSIX ipcs utility.
  91 The Linux version does not support the POSIX
  92 .BR \-a ,
  93 .B \-b
  94 and
  95 .B \-o
  96 options, but does support the
  97 .B \-l
  98 and
  99 .B \-u
 100 options not defined by POSIX.  A portable application shall not use the
 101 .BR \-a ,
 102 .BR \-b ,
 103 .BR \-o ,
 104 .BR \-l ,
 105 and
 106 .B \-u
 107 options.
 108 .SH AUTHOR
 109 .UR balasub@cis.ohio-state.edu
 110 Krishna Balasubramanian
 111 .UE
 112 .SH AVAILABILITY
 113 The ipcs command is part of the util-linux package and is available from
 114 .UR https://\:www.kernel.org\:/pub\:/linux\:/utils\:/util-linux/
 115 Linux Kernel Archive
 116 .UE .