umask

Print the current value of the file creation mode mask, or set it to value , a three-digit octal code specifying the read-write-execute permissions to be turned off. This is the opposite of chmod . Normally used in .login or .profile . umask is a built-in command in the Bourne, Korn, and C shells (see Chapter 4 and Chapter 5 ).

umask	File	Directory
Number	Permission	Permission
0	rw-	rwx
1	rw-	rw-
2	r--	r-x
3	r--	r--
4	-w-	-wx
5	-w-	-w-
6	---	--x
7	---	---

Examples

Turn off write permission for others:

umask 002		Produces file permission
 -rw-rw-r--

Turn off all permissions for group and others:

umask 077		Produces file permission
 -rw-------

Note that you can omit leading zeroes.