Unicode single quote used SH-1016

Problematic code:

echo ‘hello world’

Correct code:

echo 'hello world'

Some software may automatically replace your regular quotes with slanted Unicode quotes. Try deleting and retyping them, and/or disable “smart quotes” in your editor or OS.

Exception: If you want to use typographic single quotes, you can put them in double quotes (or typographic double quotes in single quotes) to make shellcheck ignore them, e.g., printf "Warning: ‘wakeonlan’ is not installed.\n"