ipcrm - remove a message queue, semaphore set or shared memory segment identifier
ipcrm [ -q msgid | -Q msgkey | -s semid | -S semkey | -m shmid | -M shmkey ] ...
The ipcrm utility removes zero or more message queues, semaphore sets or shared memory segments. The interprocess communication facilities to be removed are specified by the options.
Only a user with appropriate privilege is allowed to remove an interprocess communication facility that was not created by or owned by the user invoking ipcrm.
The ipcrm facility supports the XBD specification, Utility Syntax Guidelines .
The following options are supported:
- -q msgid
- Remove the message queue identifier msgid from the system and destroy the message queue and data structure associated with it.
- -m shmid
- Remove the shared memory identifier shmid from the system. The shared memory segment and data structure associated with it are destroyed after the last detach.
- -s semid
- Remove the semaphore identifier semid from the system and destroy the set of semaphores and data structure associated with it.
- -Q msgkey
- Remove the message queue identifier, created with key msgkey, from the system and destroy the message queue and data structure associated with it.
- -M shmkey
- Remove the shared memory identifier, created with key shmkey, from the system. The shared memory segment and data structure associated with it are destroyed after the last detach.
- -S semkey
- Remove the semaphore identifier, created with key semkey, from the system and destroy the set of semaphores and data structure associated with it.
The following environment variables affect the execution of ipcrm:
- Provide a default value for the internationalization variables that are unset or null. If LANG is unset or null, the corresponding value from the implementation-dependent default locale will be used. If any of the internationalization variables contain an invalid setting, the utility will behave as if none of the variables had been set.
- If set to a non-empty string value, override the values of all the other internationalization variables.
- Determine the locale for the interpretation of sequences of bytes of text data as characters (for example, single- as opposed to multi-byte characters in arguments).
- Determine the locale that should be used to affect the format and contents of diagnostic messages written to standard error.
- Determine the location of message catalogues for the processing of LC_MESSAGES .
Used only for diagnostic messages.
The following exit values are returned:
- Successful completion.
- An error occurred.
ipcs, the XSH specification description of msgctl(), semctl(), shmctl().