SC2037 – ShellCheck Wiki

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To assign the output of a command, use var=$(cmd) .

Problematic code:

var=grep -c pattern file

Correct code:

var=$(grep -c pattern file)

Rationale:

To assign the output of a command to a variable, use $(command substitution). Just typing a command after the = sign does not work.

Exceptions:

None.

This warning triggers generally for var=value -flag and var=value *glob*. See related warning SC2209 which matches var=commonCommand.

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