I have a backgrounded process that I would like to wait for (in case it fails or dies), unless I receive user input. Said another way, the user input should interrupt my waiting.
Here's a simplified snippet of my code
#!/bin/bash
...
mplayer -noconsolecontrols "$media_url" &
sleep 10 # enough time for it to fail
ps -p $!
if [ $? -ne 0 ]
then
fallback
else
read
kill $!
fi
The line that I particularly dislike is sleep 10, which is bad because it could be too much time, or not enough time.
Is there a way to wait $! || read or the equivalent?
Use kill -0 to validate that the process is still there and read with a timeout of 0 to test for user input. Something like this?
pid=$!
while kill -0 $pid; do
read -t 0 && exit
sleep 1
done
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