How to run multiple commands at the same time in bash instead of running one after another?

Question

I need to run more than one command in bash without waiting to finishing first one and starting other command. The commands can be like this inside bash file.

#!/bin/bash
perl test.pl -i file1 -o out1
perl test.pl -i file2 -o out2
and so on

All should run at the same time in different cores instead of running one after another.

See gnu.org/software/bash/manual/bashref.html#Lists and read for "background". — Etan Reisner
– Etan Reisner, Commented Oct 13, 2015 at 16:58
Possible duplicate of How do you run multiple programs from a bash script? — Cyrus
– Cyrus, Commented Oct 13, 2015 at 17:03

A.P. · Accepted Answer · 2015-10-13 17:18:53Z

2

Background them with &:

#!/bin/bash
perl test.pl -i file1 -o out1 &
perl test.pl -i file2 -o out2 &

Or better yet, use GNU parallel. This will allow you to use multiple CPUs and lots more.

answered Oct 13, 2015 at 17:18

A.P.

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