SC2040 – ShellCheck Wiki

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#!/bin/sh was specified, so ____ is not supported, even when sh is actually bash.

The shebang indicates that the script works with /bin/sh, but you are using non-standard features that may not work with /bin/sh, even if /bin/sh is actually bash. Bash behaves differently when invoked as sh, and disabling support for the highlighted feature is one part of that.

Specify #!/usr/bin/env bash to ensure that bash (or your shell of choice) will be used, or rewrite the script to be more portable.

The Ubuntu wiki has a list of portability issues and suggestions on how to rewrite them.

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