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ipcrm
Delete a message queue, semaphore set, or shared memory identifier.
Additional information
The ipcrm command is used to delete one or more message queues, semaphore sets, or shared memory identifiers.
grammar
ipcrm [ -m SharedMemoryID ] [ -M SharedMemoryKey ] [ -q MessageID ] [ -Q MessageKey ] [ -s SemaphoreID ] [ -S SemaphoreKey ]
Options
-m SharedMemoryID: Delete the shared memory identifier SharedMemoryID. The shared memory segment and data structures associated with SharedMemoryID will be deleted after the last detach operation.-M SharedMemoryKey: Delete the shared memory identification created with the keyword SharedMemoryKey. The associated shared memory segments and data structure segments will be deleted after the last detachment operation.-q MessageID: Delete the message queue identifier MessageID and its related message queue and data structures.-Q MessageKey: Delete the message queue ID created by the keyword MessageKey and its related message queue and data structures.-s SemaphoreID: Delete the semaphore ID SemaphoreID and its related semaphore sets and data structures.-S SemaphoreKey: Delete the signal identifier created by the keyword SemaphoreKey and its related semaphore set and data structure.
IDs and keywords can be found using the ipcs command.
Example
If you want to delete the shared memory segment related to SharedMemoryID 18602, execute the following command:
ipcrm -m 18602
lprm
Delete print jobs from the print queue.
Additional information
The lprm command is used to delete print tasks in the print queue. Unfinished print jobs will be placed in the printer queue, and this command can be used to cancel jobs that have not yet been sent to the printer.
grammar
lprm [选项] [参数]
Options
-E: Force encryption when connecting to the print server.-P: Specify the target printer to accept printing tasks.-U:Specify an optional username.
parameter
- Print task: Specify the print task number to be deleted.
Example
Remove task No. 102 from the printer hpprint:
lprm -Phpprint 102
Remove task number 101 from the default printer:
lprm 101
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