IPCRM(1) User Commands IPCRM(1)
ipcrm - remove certain IPC resources
ipcrm [options] ipcrm [shm|msg|sem] ID ...
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. 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 (shmdt(2)) the object from their virtual address space. 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. 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'). The details of the removes are described in shmctl(2), msgctl(2), and semctl(2). The identifiers and keys can be found by using ipcs(1).
-a, --all [shm] [msg] [sem] Remove all resources. When an option argument is provided, the removal is performed only for the specified resource types. Warning! Do not use -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. -M, --shmem-key shmkey Remove the shared memory segment created with shmkey after the last detach is performed. -m, --shmem-id shmid Remove the shared memory segment identified by shmid after the last detach is performed. -Q, --queue-key msgkey Remove the message queue created with msgkey. -q, --queue-id msgid Remove the message queue identified by msgid. -S, --semaphore-key semkey Remove the semaphore created with semkey. -s, --semaphore-id semid Remove the semaphore identified by semid. -V, --version Display version information and exit. -h, --help Display help text and exit.
In its first Linux implementation, ipcrm used the deprecated syntax shown in the second line of the SYNOPSIS. Functionality present in other *nix implementations of ipcrm 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.
ipcmk(1), ipcs(1), msgctl(2), msgget(2), semctl(2), semget(2), shmctl(2), shmdt(2), shmget(2), ftok(3), sysvipc(7)
For bug reports, use the issue tracker at https://github.com/karelzak/util-linux/issues.
The ipcrm command is part of the util-linux package which can be downloaded from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils/util-linux/>. This page is part of the util-linux (a random collection of Linux utilities) project. Information about the project can be found at ⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩. If you have a bug report for this manual page, send it to email@example.com. This page was obtained from the project's upstream Git repository ⟨git://git.kernel.org/pub/scm/utils/util-linux/util-linux.git⟩ on 2021-06-20. (At that time, the date of the most recent commit that was found in the repository was 2021-06-18.) If you discover any rendering problems in this HTML version of the page, or you believe there is a better or more up-to-date source for the page, or you have corrections or improvements to the information in this COLOPHON (which is not part of the original manual page), send a mail to firstname.lastname@example.org util-linux 2.37.85-637cc 2021-04-02 IPCRM(1)
Pages that refer to this page: ipcmk(1), ipcs(1), lsipc(1), pcp-ipcs(1), sysvipc(7)