SC2280 – ShellCheck Wiki

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`$0` can't be assigned this way, and there is no portable alternative.

Problematic code:

#!/bin/sh
$0=myname

Correct code:

$0 can not be changed in a portable way.

Rationale:

You appear to be trying to assign a new value to $0 in a sh script.

There is no portable way to do this. Write around it, or switch to Bash.

Exceptions:

If you instead wanted to compare the value of $0, use a comparison like [ "$0" = "myname" ].

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ShellCheck is a static analysis tool for shell scripts. This page is part of its documentation.