umask

User's file creation mask. Set the shell process's file creation mask to mode.

Syntax
      umask [-p] [-S] [mode]

Key
   mode  File creation mask
   -S    Print the mask in symbolic format (the default is an octal number)
   -p    Output in a form that may be reused as input (if mode is omitted)

The current value of the mask will be printed if mode is omitted. By default OS X will set it to 0022 (022)

If mode begins with a digit, it is interpreted as an octal number; otherwise it is interpreted as a symbolic mode mask similar to that accepted by chmod.

Note that when the mode is interpreted as an octal number, each number of the umask is subtracted from 7. Thus, a umask of 022 results in permissions of 755.

The return status is 0 if the mode was successfully changed or if no mode argument was supplied, and false otherwise.

Examples
Example values for the mask:
022, gives read and execute access to the group and others.

The return status is zero if the mode is successfully changed or if no mode argument is supplied, and non-zero otherwise.

Note that when the mode is interpreted as an octal number, each number of the umask is subtracted from 7. Thus, a umask of 022 results in permissions of 755.

umask is a bash built in command.

"Woe to him who doesn't know how to wear his mask, be he king or Pope!" ~ Luigi Pirandello

Related:

chmod - Change access permissions
chown - Change file owner and group


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