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This apostrophe terminated the single quoted string!

Problematic code:

echo 'Nothing so needs reforming as other people's habits.'

Correct code:

echo 'Nothing so needs reforming as other people'\''s habits.'

or

echo "Nothing so needs reforming as other people's habits."

Rationale:

When writing a string in single-quotes, you have to make sure that any apostrophes in the text don't accidentally terminate the single-quoted string prematurely.

Escape them properly (see the correct code) or switch quotes to avoid the problem.

Exceptions:

None.

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