You signed in with another tab or window. Reload to refresh your session.You signed out in another tab or window. Reload to refresh your session.You switched accounts on another tab or window. Reload to refresh your session.Dismiss alert
maxnikulin edited this page Apr 14, 2023
·
9 revisions
In POSIX sh, ^ in place of ! in glob bracket expressions is undefined.
Problematic code:
echo foo-[^0]*.jpg
Correct code:
echo foo-[!0]*.jpg
Rationale:
[^c] is frequently used in most regular expression variants to mean "any character except c". Ksh and Bash adopted it for globs as well.
However, strictly speaking, the only range complement syntax guaranteed to be supported across shells is [!c]. Dash only supports it when using fnmatch and glob from glibc.
Exceptions:
If you only intend to target shells that supports this feature, you can change
the shebang to a shell that guarantees support, or ignore this warning.
Or just rewrite it to be on the technically correct side.