SUMMARY: how to capture PID at execution time

From: Dan's generic account <>
Date: Wed Mar 30 2005 - 13:58:48 EST
Thanks to all those that replied.

The answer is:

$! 	returns pid of last background process
$$	returns current process pid.

The "gotcha" i had was that my script executes more scripts to run the httpd.
I couldn't capture the pid of commands in sub-scripts.

I found that by obtaining the pid of the master script when started 
"echo $$ > /var/run/" (declared at begging of script)
i could use this group pid to kill all processes started by the main script with:
pkill -g `cat /var/run/`


On Tue, 2005-03-29 at 20:24, Dan's generic account wrote:
> Hi all
> Is it possible to capture the PID of a command at the time of execution and
> write it to a log file???
> I need to capture the PID at the time of execution, as several instances of
> the command will be run at the same time, i need to make sure that the correct
> process is killed when required.
> an example would be having several instances httpd running.
> running the httpd startup script produces the following output:
> ./scripts/ 2>&1 |tee /var/log/jini.httpd.log &
> [1] 1199
> bash-2.03# Mar 29, 2005 8:28:05 PM com.sun.jini.tool.ClassServer run
> INFO: ClassServer started [lib/dl/, port 8082]
> the 1199 is the group process, so i could just use "kill -- -1199". any child
> process die.
> The above pipe to tee does not report the group PID. i just get the
> following:
> bash-2.03# cat /var/log/jini.httpd.log
> Mar 29, 2005 8:28:05 PM com.sun.jini.tool.ClassServer run
> INFO: ClassServer started [lib/dl/, port 8082]
> how can i trap the PID?
> Thanks
> Dan.
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Received on Wed Mar 30 14:10:09 2005

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