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  • Shellcheck
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sudo apt install -y shellcheck

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❯ shellcheck test/a.sh

In test/a.sh line 5:
echo $GGG
     ^--^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
echo "$GGG"

For more information:
  https://www.shellcheck.net/wiki/SC2086 -- Double quote to prevent globbing ...