SC1054 – ShellCheck Wiki

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You need a space after the {.

Problematic code:

foo() {echo "hello world;}

Correct code:

foo() { echo "hello world;}

Rationale:

{ is only recognized as the start of a command group when it's a separate token.

If it's not a separate token, like in the problematic example, it will be considered a literal character, as if writing "{echo" with quotes, and therefore usually cause a syntax error.

Exceptions:

None.

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