ps | grep command

Sayantan · #1 (**permalink**) 01-07-2008

Hi All,
Looking for an explanation.

[sayantan:~/mydir$] ps -ef |grep sandipan
sayantan 18975 18550 97 14:54 pts/3 00:00:17 ./sandipan
sayantan 18981 3700 0 14:54 pts/4 00:00:00 grep sandipan

[sayantan:~/mydir$] ps -ef |grep sandipan
sayantan 18975 18550 97 14:54 pts/3 00:00:17 ./sandipan

porter · #2 (**permalink**) 01-07-2008

When you run "grep sandipan" that becomes an entry in the process listing.

Whether you see it or not depends on whether ps completes before the shell execs the grep.

"|" means that processes are executed in parallel, they may or may not actually overlap depending on the scheduler.

Yogesh Sawant · #3 (**permalink**) 01-07-2008

how about:

Code:

ps -ef | grep -v grep | grep sandipan

of course we're wasting some cpu time by forking one more grep

vino · #4 (**permalink**) 01-07-2008

Quote:

Originally Posted by Yogesh Sawant

how about:

Code:

ps -ef | grep -v grep | grep sandipan

of course we're wasting some cpu time by forking one more grep

Or

Code:

ps -ef | grep '[s]andipan'

gus2000 · #5 (**permalink**) 01-07-2008

Yes, but now you can't grep for ANY command with the word "grep" in it. How about:

Code:

ps -ef | grep -v " $$ .*grep " | grep sandipan

harlock59 · #6 (**permalink**) 06-07-2009

Hello,

i would like to find the name or the pid of the process that is using my /var/lib/dpkg/lock file.

how can i do that ?

thanks.

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