umask
TLDR
Show current mask
$ umask
Show symbolic$ umask -S
Set mask$ umask [022]
Restrictive mask$ umask [077]
Permissive mask$ umask [000]
SYNOPSIS
umask [-S] [mode]
DESCRIPTION
umask sets file creation mask. It affects permissions.
Default permissions. New files and directories.
Octal notation. Bits to remove.
Shell builtin. Session scope.
Security setting. Restrict access.
PARAMETERS
-S
Symbolic output.mode
Octal mask value.
COMMON VALUES
- 022 - Standard (files 644, dirs 755)
- 077 - Private (files 600, dirs 700)
- 002 - Group writable
CAVEATS
Shell builtin. Not persistent across sessions. Inverted logic.
HISTORY
umask is a standard Unix command for setting the file mode creation mask, present since early Unix.
