Run a string as a command within a Bash script

Question

I have a Bash script that builds a string to run as a command

Script:

#! /bin/bash

matchdir=\"/home/joao/robocup/runner_workdir/mat         


        

Answer 1

For me echo XYZ_20200824.zip | grep -Eo '[[:digit:]]{4}[[:digit:]]{2}[[:digit:]]{2}' was working fine but unable to store output of command into variable. I had same issue I tried eval but didn't got output.

Here is answer for my problem: cmd=$(echo XYZ_20200824.zip | grep -Eo '[[:digit:]]{4}[[:digit:]]{2}[[:digit:]]{2}')

echo $cmd

My output is now 20200824

Answer 2

I usually place commands in parentheses $(commandStr), if that doesn't help I find bash debug mode great, run the script as bash -x script