SC2297 – ShellCheck Wiki

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Double quotes must be outside ${}: ${"invalid"} vs "${valid}".

Problematic code:

echo ${"USER"}

Correct code:

echo "${USER}"

Rationale:

ShellCheck found a parameter expansion containing what appears to be a quoted variable name.

While the parameter expansion itself must be quoted, as in "${valid}", the quotes may not appear inside the {} as in ${"invalid"}.

Also note that translated strings like $"Hello" may not use curly braces.

Exceptions:

None

Related resources:

• Help by adding links to BashFAQ, StackOverflow, man pages, POSIX, etc!

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