capture the process id when starting a background process

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# 1  
Old 03-28-2002
capture the process id when starting a background process

Hello all,
How do I start a background process and save the process id to a file on my system. For example %wait 5 & will execute and print the process id. I can't figure out how to get it to a file. I've tried: > filename 0>filename 1>filename.
Any assistance is most appreciated.
Jim Leavitt
# 2  
Old 03-28-2002
Sounds like it "could be homework, but I will help none the less.

ioscan -fnC disk & ps -aef |grep ioscan|grep -v ps | awk '{ print $2 }' > cap.PID

This may capture the PID of the ps command, but it works. Even though it is crude.

# 3  
Old 03-28-2002
Originally posted by Kelam_Magnus

ioscan -fnC disk & ps -aef |grep ioscan|grep -v ps | awk '{ print $2 }' > cap.PID

This may capture the PID of the ps command, but it works. Even though it is crude.

If you use:

ps -ef | grep "[i]oscan" | awk '{print $2}'

then you will not have to worry about capturing the PID of ps -- a handy side effect of using the square brackets.
# 4  
Old 03-28-2002
Thanks for the help, it's close but it doesnt work. This isn't homework, and I should know how to do this myself. I don't. We've got a socket server we want to start and kill nightly. The only way I can think of is to keep the pid around so I know what to kill at night. Any additional help is most appreciated!
Jim Leavitt
Romac Industries, Inc.Smilie
# 5  
Old 03-28-2002
Can you modify the source to the server? If so just have it write its PID to a file somewhere.
# 6  
Old 03-29-2002
Did you try 2>filename?
Also, how is it started?
Some shells, like bash, will store the value of the previous process ID. In bash, I believe it is $PPID.
I can't remember for sure though... anyone else know?
# 7  
Old 03-29-2002
jleavitt, what shell, OS version?

I think his main problem is that he wants to run this in the background. So, when the process kicks off nothing prints to the screen.

I was trying to capture the PID with ps because 2> won't work because there is nothing to capture. Although the " [1] 12345 " appears on the screen, it is after the process is kicked to the background.

It would be easy to do this except that he is trying to run it in the background.

The only thing I can see is to grep for the PID after you kick off the background process.
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