$ Linux Command

Permissions

umask

Set default file permission mask.

userpermissionsadmin

Additional Notes

umask is a user and permission command used to set default file permission mask. It sets the default permissions for newly created files and directories by masking bits in the mode.

A umask of 022 (common default) gives files 644 and directories 755. Use umask -S to view the mask in symbolic form.

Syntax

umask [options] [user-or-target]

Parameters

  • options: Flags that change how umask behaves.
  • user: User account affected by the command.
  • group: Group account affected by the command.
  • file: File or directory whose ownership, mode, or access policy is being changed.

Common Options

  • --help: Show command help when supported.
  • --version: Show version information when supported.

Examples

umask --help
man umask

Practical Notes

Options can vary by distribution and package version. Use man umask, umask --help, or the package documentation for exact syntax.