=if trying to assign a value (or for empty string, use
# I want programs to show text in Dutch! LANGUAGE= nl
# I want to run the nl command with English error messages! LANGUAGE= nl
# I want programs to show text in Dutch! LANGUAGE=nl
# I want to run the nl command with English error messages! LANGUAGE='' nl
It's easy to think that
LANGUAGE= nl would assign
"nl" to the variable
LANGUAGE. It doesn't.
Instead, it runs
nl (the "number lines" command) and sets
LANGUAGE to an empty string in its environment.
Since trying to assign values this way is a common mistake, ShellCheck warns about it and asks you to be explicit when assigning empty strings (except for
IFS, due to the common
IFS= read .. idiom).
If you're familiar with this behavior and feel that the explicit version is unnecessary, you can ignore it.
ShellCheck is a static analysis tool for shell scripts. This page is part of its documentation.