Provided by: util-linux_2.36.1-8ubuntu1_amd64 bug

NAME

       ipcs - show information on IPC facilities

SYNOPSIS

       ipcs [options]

DESCRIPTION

       ipcs  shows information on System V inter-process communication facilities.  By default it
       shows information about all three resources: shared memory segments, message  queues,  and
       semaphore arrays.

OPTIONS

       -i, --id id
              Show  full  details on just the one resource element identified by id.  This option
              needs to be combined with one of the three resource options: -m, -q or -s.

       -h, --help
              Display help text and exit.

       -V, --version
              Display version information and exit.

   Resource options
       -m, --shmems
              Write information about active shared memory segments.

       -q, --queues
              Write information about active message queues.

       -s, --semaphores
              Write information about active semaphore sets.

       -a, --all
              Write information about all three resources (default).

   Output formats
       Of these options only one takes effect: the last one specified.

       -c, --creator
              Show creator and owner.

       -l, --limits
              Show resource limits.

       -p, --pid
              Show PIDs of creator and last operator.

       -t, --time
              Write time information.  The time of the last control operation  that  changed  the
              access permissions for all facilities, the time of the last msgsnd(2) and msgrcv(2)
              operations on message queues, the time of the last shmat(2) and shmdt(2) operations
              on shared memory, and the time of the last semop(2) operation on semaphores.

       -u, --summary
              Show status summary.

   Representation
       These affect only the -l (--limits) option.

       -b, --bytes
              Print sizes in bytes.

       --human
              Print sizes in human-readable format.

CONFORMING TO

       The  Linux  ipcs  utility  is  not  fully compatible to the POSIX ipcs utility.  The Linux
       version does not support the POSIX -a, -b and -o options, but does support the -l  and  -u
       options  not  defined  by POSIX.  A portable application shall not use the -a, -b, -o, -l,
       and -u options.

NOTES

       The current implementation of ipcs obtains information about available  IPC  resources  by
       parsing  the  files  in  /proc/sysvipc.   Before  util-linux  version  v2.23, an alternate
       mechanism was used: the IPC_STAT command of msgctl(2),  semctl(2),  and  shmctl(2).   This
       mechanism  is  also  used  in  later  util-linux  versions  in  the  case  where  /proc is
       unavailable.  A limitation of the IPC_STAT mechanism is  that  it  can  only  be  used  to
       retrieve information about IPC resources for which the user has read permission.

AUTHORS

       Krishna Balasubramanian ⟨balasub@cis.ohio-state.edu

SEE ALSO

       ipcmk(1),   ipcrm(1),  msgrcv(2),  msgsnd(2),  semget(2),  semop(2),  shmat(2),  shmdt(2),
       shmget(2), sysvipc(7)

AVAILABILITY

       The ipcs command is part of the util-linux package and  is  available  from  Linux  Kernel
       Archive ⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩.