Execute command while process is running and end once process ends using bash

Question

I am trying to create a while loop that will print "." while a shell script process is running and stop printing when the process has finished. My code continues to print "." after launch.sh has completed.

sh launch.sh & PIDIOS=$! dot_function() { running=$(ps aux | grep launch.sh | wc -l) while [ $running -ge 1 ]; do if [ $running -lt 1 ]; then break elif [ $running -ge 1 ]; printf "." sleep 1 fi done } dot_function & PIDMIX=$

You're never updating the running variable in your loop.

fireshadow52
– fireshadow52

2022-05-11 17:29:44 +00:00
Commented May 11, 2022 at 17:29 — fireshadow52
– fireshadow52, Commented May 11, 2022 at 17:29

Fravadona · Accepted Answer · 2022-05-11 20:02:38Z

1

How about using kill -0?

dotwait() { while kill -0 "$1" 2>/dev/null do printf . sleep 1 done echo } sh launch.sh & dotwait "$!"

edited May 11, 2022 at 20:02

answered May 11, 2022 at 17:47

Fravadona

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1 Comment

pretz Over a year ago

Good question! That works perfectly and much simpler. Thank you!

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