Linux umask Command

Linux Command Manual

The Linux umask command specifies the default permission mask for newly created files.

umask is used to set the [permission mask]. The [permission mask] consists of three octal digits, and by subtracting the existing access permissions from the permission mask, the default permissions for newly created files are generated.

Syntax

umask [-S][permission mask]

Parameter Description:

-S 　Display the permission mask in symbolic form.

Example

To view the current permission mask using the "umask" command, enter the following command:

$ umask                         # Get the current permission mask

After executing the above command, the output is as follows:

Next, create a directory using the "mkdir" command and get detailed information about the directory using the "ls" command by entering the following commands:

$ mkdir test1                       # Create a directory
$ ls -d -l test1/                   # Display detailed information about the directory

After executing the above commands, the detailed information of the newly created directory will be displayed as follows:

drwxr-xr-x 2 rootlocal rootlocal 4096 2011-9-19 21:46 test1/

Note: In the output above, "drwxr-xr-x" = "777-022=755".

Linux Command Manual

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