Shell Programming and Scripting

Hi,

Can someone please advise how to get a login's process ID?

From the command line, echo $$ will show what I assume is my login's process ID. Is is possible to get this process ID from within a script?

To give a clear picture of what am wanting to achieve, I have a script that has to be run via su - sybase. The script searches for ps -ef | grep sybase | grep -v grep and then do a kill -9 of those processes, but doing so include that process that does the su - sybase as well so am wanting to be able to check what is the process ID of the su - sybase so I can exclude it from the the kill script.

FYI, the kill script has an exit at the end.

Any suggestion will be much appreciated. Thanks in advance.

echo $$ from the script. also you generally should avoid using kill -9 and only use this as a last resort. running kill -9 on database processes can cause corruption. if you really want to kill them then just kill it from root. no need for su.

$$ is the current shell process ID Might be its parent process id which might be in the $PPID variable.
"kill -9" is almost always unwise, especially when done on sensitive processes like databases.
That's tortuous. Use pkill instead.
Which is probably useless as the script will exit at the end anyway ...

Hi,

Oops, I think I placed the wrong title, what I meant is the process ID of the current login not the script as the script is ran using su - sybase. So am wanting to get the process ID of the su - sybase so I can exclude it.

The database does not run on this server, however I need to terminate the connections whenever this server has to fail over from one cluster to the other.

---------- Post updated at 11:02 PM ---------- Previous update was at 11:00 PM ----------

Hi,

Oops, I think I placed the wrong title, what I meant is the process ID of the current login not the script as the script is ran using su - sybase. So am wanting to get the process ID of the su - sybase so I can exclude it, is that the PPID as you mentioned?

The database does not run on this server, however I need to terminate the connections whenever this server has to fail over from one cluster to the other.

you dont have to worry about the process id for the su process. this is running as root and the sybase user does not have permisson to kill it.

Don't confuse goals and ways to achieve them.
Do you want to retrieve specific process IDs or do you want to kill all the processes related to sybase ?

Code:

Rather than:
ps -ef|grep "sybase"

Why not confine the list to those processes owned by user "sybase"?
ps -fusybase

Btw. I agree that "kill -9" is not good for database processes or process trees. Perhaps try "kill -15", wait a bit, then issue "kill -9" as a last resort.