Different Umask for Directories and Files

umask

How can I set up a different umask for directories then files?

I need dirs with umask 003 and files with umask 117

Best Answer

umask is global in bash. One thing you could do is to create a mkdir wrapper(a script, you give the name to it) that would change the mask after executing it.

#!/bin/bash
umask 0701 ; /path/to/real/mkdir $1 ; umask 0604

This was answered here:

Remember: For directories, the base permissions are (rwxrwxrwx) 0777 and for files they are 0666, meaning, you will not achieve execute permissions on file creation inside your shell even if the umask allows. This is clearly done to increase security on new files creation.

Example:

[admin@host test]$ pwd
/home/admin/test
[admin@host test]$ umask
0002
[admin@host test]$ mkdir test
[admin@host test]$ touch test_file
[admin@host test]$ ls -l
total 4
drwxrwxr-x 2 admin admin 4096 Jan 13 14:53 test
-rw-rw-r-- 1 admin admin    0 Jan 13 14:53 test_file

umask Unix Specification tells nothing about this file permission math specifics. It's up to the shell developers to decide(and OS makers).

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