SC2296 – ShellCheck Wiki

Parameter expansions can't start with `{`. Double check syntax.

(or any other character)

Problematic code:

echo "Hello ${{name}"

Correct code:

echo "Hello ${name}"

Rationale:

ShellCheck found a parameter expansion ${something} that starts with an invalid character. In the example, this was caused by accidentally duplicating the { in ${{name}.

Double check the syntax of what you're trying to do.

Exceptions:

Some Zsh specific parameter expansions like ${(q)value} trigger this warning, but ShellCheck does not support Zsh.

If this warning triggers in code that works on Bash, Ksh, Dash or Sh, please submit a bug.

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.