SC2284 – ShellCheck Wiki

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Use [ x = y ] to compare values (or quote '==' if literal).

Problematic code:

if $var == value
then
  echo "Match"
fi

Correct code:

if [ "$var" = value ]
then
  echo "Match"
fi

Rationale:

ShellCheck found an unquoted == after a word.

This was most likely supposed to be a comparison, so use square brackets as in the correct code.

Exceptions:

If the == was supposed to be literal, you can quote it to make ShellCheck ignore it:

grep '===' file.js

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