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I am running a command that's processing some data in one shell window (let's say it has pid 200). Unfortunately I forgot to add the & to run it in the background.

I need to run some analysis script after pid 200 is finished. I thought I could just open up another shell window and do

wait 200; ./myanalysis.sh

But it complains to me

"-bash: wait: pid 200 is not a child of this shell"

With that in mind, is there a way I can execute my analysis script automatically after this process terminates?

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2 Answers 2

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You can't "wait" for non-child processes, and you have to manually check it periodically. See for example this stack overflow answer.

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Can you use ^z and then do the following?

wait 200; ./myanalysis.sh&
fg %1

This will wait till pid 200 is finished, then run your analysis, and then will put itself in foreground.

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  • You can if it's a child process of your current terminal...
    – rogerdpack
    Jul 22, 2018 at 5:09

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