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Ipcs

The ipcs directive is used to show the state of interprocess communication. The "- I" option allows you to specify a specific resource id. Only information about this id will be printed.

The scope of this command: RedHat, RHEL, Ubuntu, CentOS, Fedora, SUSE, openSUSE.

1. Grammar

Ipcs [- asmq] [- tclup]

Ipcs [- smq]-I id

Ipcs-h

2. List of options

Option

Description

-I

Displays information for the specified id

-m

Display information about shared memory segments

-Q

Display queue information

S

Display semaphore information

-a

Show all information, default option

-t

Show usage time

-p

Show process pid

-c

Show process creator

-u

Show summation

-l

Display limit

3. Examples

1) display semaphore information

[root@localhost ntop-4.0.1] # ipcs-s / / shows the usage of semaphores

-Semaphore Arrays-

Key semid owner perms nsems

0x00000000 0 root 600 1

0x00000000 65537 root 600 1

0x00000000 98306 apache 600 1

0x00000000 196611 apache 600 1

0x00000000 229380 apache 600 1

2) display shared memory usage

[root@localhost ntop-4.0.1] # ipcs-m-p / / displays shared memory information and process pid

-Shared Memory Creator/Last-op-

Shmid owner cpid lpid

163840 david 2233 2264

196609 david 2262 2267

229378 david 2278 2014

262147 david 2282 2014

294916 david 2289 2014

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