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Shell Programming and Scripting

Check if PID exists

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# 1  
Old 03-11-2013
Check if PID exists
In a Shell Script what is the most generic way to find in the PID exists or not.

If it does not exist how can I echo the user "PID does not exist" & terminate the unix script ?

If the command can work on most flavors of operating system the more useful I will find it to be.

Current system is HP-UX.

Thank you for your suggestions.
# 2  
Old 03-11-2013
u can use

ps -ef | grep PID | grep -v grep
This User Gave Thanks to PikK45 For This Post:
mohtashims
# 3  
Old 03-11-2013
RedHat
you can

Code:
echo $$

to know the pid of the script you executed
# 4  
Old 03-11-2013
Hi, this is a way:
Code:
ps -ef|awk '{printf "%s\n",$2;}'|grep -q -w $MYPID

then check the $? variable: if 0 the pid exists, else not exists.
This User Gave Thanks to franzpizzo For This Post:
mohtashims
# 5  
Old 03-11-2013
Quote:
Originally Posted by sam05121988
you can

Code:
echo $$

to know the pid of the script you executed
I dont want PID of the script but i need to check the PID i pass to my script.

Can you also tell me how do I come out of the script if the PID does not exist ?
# 6  
Old 03-11-2013
Code:
[[ pgrep "process_name" ]] && echo "Process Present" || echo "Process is not present"

Try with pgrep if it not works then just replace fist bracket command with other suggested option in this thread.
# 7  
Old 03-11-2013
Ubuntu
The problem is that it is populating the script that i am executing as i pass the PID to the script the "ps" command wrongly thinks that the process exists when it does not.

Below is the out of my ps -ef | grep <PID> | grep -v grep command

Code:
 
 
ps -xef | grep  | grep 15160 | grep -v grep;
 
 
bea 25845 14840  0 05:28:04 pts/7     0:00 /bin/sh ./Master_Script.sh weblogic 15160 /tmp/user_projects/domains/mydomain /tmp/ system password

The output should be blank becoz there is no process as 15160.

Kindly suggest.
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