I am running a script which is using tee to log the output to screen and also to a file:
{ echo "hello world" ; exit 1; } | tee -a logfile.log
The exit is not working. I can't exit my script. When I delete tee, it works. Why is that?
Why does "exit" not exit my script when I pipe it to "tee"?
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2 Answers
As covered elsewhere (including, somewhat indirectly, BashFAQ #24), pipelines create subshells, so your exit exits only the subshell.
You can avoid this by replacing the pipeline with a redirection to a process substitution:
{ echo "hello world"; exit 1; } > >(tee -a logfile.log)
It happens because the pipeline spawns a subshell for each component, so the exit runs inside this new shell.
You should rewrite the script like:
echo "hello world" | tee -a logfile.log
exit 1
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