I'm attempting to speed up a collection of scripts that invoke subshells and do all sorts of things. I was wonder if there are any tools available to time the execution of a shell script and its nested shells and report on which parts of the script are the most expensive.

For example, if I had a script like the following.

#!/bin/bash

echo "hello"
echo $(date)
echo "goodbye"

I would like to know how long each of the three lines took. time will only only give me total time for the script. bash -x is interesting but does not include timestamps or other timing information.

performance bash
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