umask

umask

 [

value

]

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 . Usually used in .login or .profile . umask is available as a built-in command in the Bourne and C shells (see Sections 4 and 5).

umask Number	File Permission	Directory 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.