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+.\" Copyright 2002 Andre C. Mazzone (linuxdev@karagee.com)
+.\" May be distributed under the GNU General Public License
+.TH IPCRM "1" "July 2014" "util-linux" "User Commands"
+.SH NAME
+ipcrm \- remove certain IPC resources
+.SH SYNOPSIS
+.B ipcrm
+[options]
+.sp
+.B ipcrm
+.RB { shm | msg | sem }
+.IR id ...
+.SH DESCRIPTION
+.B ipcrm
+removes System V inter-process communication (IPC) objects
+and associated data structures from the system.
+In order to delete such objects, you must be superuser, or
+the creator or owner of the object.
+.PP
+System V IPC objects are of three types: shared memory,
+message queues, and semaphores.
+Deletion of a message queue or semaphore object is immediate
+(regardless of whether any process still holds an IPC
+identifier for the object).
+A shared memory object is only removed
+after all currently attached processes have detached
+.RB ( shmdt (2))
+the object from their virtual address space.
+.PP
+Two syntax styles are supported.  The old Linux historical syntax specifies
+a three-letter keyword indicating which class of object is to be deleted,
+followed by one or more IPC identifiers for objects of this type.
+.PP
+The SUS-compliant syntax allows the specification of
+zero or more objects of all three types in a single command line,
+with objects specified either by key or by identifier (see below).
+Both keys and identifiers may be specified in decimal, hexadecimal
+(specified with an initial '0x' or '0X'), or octal (specified with
+an initial '0').
+.PP
+The details of the removes are described in
+.BR shmctl (2),
+.BR msgctl (2),
+and
+.BR semctl (2).
+The identifiers and keys can be found by using
+.BR ipcs (1).
+.SH OPTIONS
+.TP
+\fB\-a\fR, \fB\-\-all\fR [\fBshm\fR] [\fBmsg\fR] [\fBsem\fR]
+Remove all resources.  When an option argument is provided, the removal is
+performed only for the specified resource types.  \fIWarning!\fR  Do not use
+.B \-a
+if you are unsure how the software using the resources might react to missing
+objects.  Some programs create these resources at startup and may not have
+any code to deal with an unexpected disappearance.
+.TP
+.BR \-M , " \-\-shmem\-key " \fIshmkey
+Remove the shared memory segment created with
+.I shmkey
+after the last detach is performed.
+.TP
+.BR \-m , " \-\-shmem\-id " \fIshmid
+Remove the shared memory segment identified by
+.I shmid
+after the last detach is performed.
+.TP
+.BR \-Q , " \-\-queue\-key " \fImsgkey
+Remove the message queue created with
+.IR msgkey .
+.TP
+.BR \-q , " \-\-queue\-id " \fImsgid
+Remove the message queue identified by
+.IR msgid .
+.TP
+.BR \-S , " \-\-semaphore\-key " \fIsemkey
+Remove the semaphore created with
+.IR semkey .
+.TP
+.BR \-s , " \-\-semaphore\-id " \fIsemid
+Remove the semaphore identified by
+.IR semid .
+.TP
+.BR \-V , " \-\-version"
+Display version information and exit.
+.TP
+.BR \-h , " \-\-help"
+Display help text and exit.
+.SH NOTES
+In its first Linux implementation, \fBipcrm\fR used the deprecated syntax
+shown in the second line of the
+.BR SYNOPSIS .
+Functionality present in other *nix implementations of \fBipcrm\fR has since
+been added, namely the ability to delete resources by key (not just
+identifier), and to respect the same command-line syntax.  For backward
+compatibility the previous syntax is still supported.
+.\" .SH AUTHORS
+.\" Andre C. Mazzone (linuxdev@karagee.com)
+.\" .br
+.\" Krishna Balasubramanian (balasub@cis.ohio-state.edu)
+.SH SEE ALSO
+.nh
+.BR ipcmk (1),
+.BR ipcs (1),
+.BR msgctl (2),
+.BR msgget (2),
+.BR semctl (2),
+.BR semget (2),
+.BR shmctl (2),
+.BR shmdt (2),
+.BR shmget (2),
+.BR ftok (3),
+.BR sysvipc (7)
+.SH AVAILABILITY
+The ipcrm command is part of the util-linux package and is available from
+.UR https://\:www.kernel.org\:/pub\:/linux\:/utils\:/util-linux/
+Linux Kernel Archive
+.UE .