ipcs和ipcsrm 命令的使用方法

ipcs - provide information on ipc facilities

SYNOPSIS

ipcs [ -asmq ] [ -tclup ]
ipcs [ -smq ] -i id
ipcs -h

DESCRIPTION

ipcs provides information on the ipc facilities for which the calling process has read acccess.

The -i option allows a specific resource id to be specified. Only information on this id will be printed.

Resources may be specified as follows:

-m

shared memory segments

-q

message queues

-s

semaphore arrays

-a

all (this is the default)

The output format may be specified as follows:

-t

time

-p

pid

-c

creator

-l

limits

-u

summary

ipcrm [ -M key | -m id | -Q key | -q id | -S key | -s id ] ...

deprecated usage

ipcrm [ shm | msg | sem ] id ...

DESCRIPTION

ipcrm removes System V interprocess 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 ((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').

OPTIONS

-M shmkey

removes the shared memory segment created with shmkey after the last detach is performed.

-m shmid

removes the shared memory segment identified by shmid after the last detach is performed.

-Q msgkey

removes the message queue created with msgkey.

-q msgid

removes the message queue identified by msgid.

-S semkey

removes the semaphore created with semkey.

-s semid

removes the semaphore identified by semid.