How to measure time of program execution in bash
Sometimes you want to compare the execution time between two different implementations in your scripts, so to do this easily use the
time built-in shell tool.
First you must know the path of your time shell tool.
$ which time /usr/bin/time
If you use
time directly could have some troubles.
$ time -f %e sleep 4 -f: command not found real 0m0.071s user 0m0.056s sys 0m0.012s
which time result to use it instead.
$ /usr/bin/time -f %e sleep 4 4.00
You'll get the result in seconds.
The structure must be like
/usr/bin/time -f %e YOUR SCRIPT INSTRUCTIONS HERE