My continuing educational journey.
It was pointed out to me that at least procmail will lock the mail file
whereas my script was not. So I decided to see what it would take to
add locking.
I found https://www.putorius.net/lock-files-bash-scripts.html, and part
of it is not making sense to me.
The following is suppose to be an example of making a script waiting
indefinitely for the an earlier instance to complete:
#!/bin/bash
exec 100>/var/tmp/testlock.lock || exit 1
flock 100 || exit 1
echo "Doing some stuff…"
echo "Sleeping for 30 seconds…"
sleep 30
I get the exec line's exit 1: If you can't get the file descriptor,
something is wrong and exit.
But the next line does not make sense. If you can't lock exit? How is
that indefinite?
I see the timed lock that uses:
flock -w 10 100 || exit 1
Which will wait 10 sec to lock the file and if not then quit.
So how does that first example work?
thanks
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