SC3037 – ShellCheck Wiki

See this page on GitHub


In POSIX sh, echo flags are undefined.

Problematic code:

echo -ne 'Foo:\tBar'

Correct code:

Rewrite in terms of the more robust and standardized printf:

printf 'Foo:\tBar'


echo has historically behaved differently on different systems. Use printf instead to ensure compatibility between shells.


If you only intend to target systems that supports this feature, you can change the shebang to a shell that guarantees support, or ignore this warning.

You can use # shellcheck disable=SC3000-SC4000 to ignore all such compatibility warnings.

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