PROCESS CHECKING USING PIDs

ratul_11 · 02-21-2008, 12:03 PM

Dear All
If i want to check a process is running or not by using PIDs. Like
ps -ef | grep -v grep| grep httpd but here I dont want to use any service name( like httpd or mysqld) I only want to use pid like this

ps -ef | grep -v grep| grep 2180 .But one problem I am facing using this if there is some process of PID 12( And I want to get output for the process with PID 12) and some process with PID 5612 but using the command syntax ps -ef | grep -v grep| grep 12 is printing all process containg digit 12 in their PIDs. How to solve this problem ?

Thanks&Regards in advance
Anirban Adhikary.

unSpawn · 02-21-2008, 12:43 PM

Quote:

Originally Posted by ratul_11

ps -ef | grep -v grep| grep httpd

'pgrep' can return PIDs, could use 'pgrep -f httpd >/dev/null 2>&1 && echo running'.
And please don't use all caps for thread titles. No need to shout.

trickykid · 02-21-2008, 02:08 PM

Also, checking a PID can change on occasion, if you're wanting to use this to ensure a particular service is running, I wouldn't recommend this way of checking. And like unspawn suggested, another alternative is to use the pidof command to find the PID's of a particular service.

# pidof httpd
17141 9356 9355 9354 9353 9352 9351 9350 9349