umask - get or set the file mode creation mask.
umask [-S] [mask]
umask is a POSIX regular builtin provided by Rush. Get or set the file mode creation mask.
This page summarizes the builtin in Rush documentation. POSIX is the normative reference for detailed portable behavior.
See the POSIX definition for command-specific status rules. Usage errors generally return a non-zero status.
rush-builtins(7), POSIX Shell Command Language.