SC2035 – ShellCheck Wiki

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Use ./*glob* or -- *glob* so names with dashes won't become options.

Problematic code:

rm *

Correct code:

rm ./*


rm -- *


Since files and arguments are strings passed the same way, programs can't properly determine which is which, and rely on dashes to determine what's what.

A file named -f (touch -- -f) will not be deleted by the problematic code. It will instead be interpreted as a command line option, and rm will even report success.

Using ./* will instead cause the glob to be expanded into ./-f, which no program will treat as an option.

Similarly, -- by convention indicates the end of options, and nothing after it will be treated like flags (except for some programs possibly still special casing - as e.g. stdin).

Note that changing * to ./* in GNU Tar parameters will add ./ prefix to path names in the created archive. This may cause subtle problems (eg. to search for a specific file in archive, the ./ prefix must be specified as well). So using -- * is a safer fix for GNU Tar commands.

echo and printf does not have issues unless the glob is the first word in the command. ShellCheck 0.7.2+ does not warn for these commands.

For more information, see "Filenames and Pathnames in Shell: How to do it Correctly".

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