Umask setting (symbolic)

The umask setting strips out bits from the default permissions for new files

Files are created rw-rw-rw by default.
Directories are created rwxrwxrwx by default.

 $ umask -S
 u=rwx,g=rx,o=rx
 $ touch file1 ; mkdir dir1 ; ls -ld file1 dir1
 drwxr-xr-x  2 reegen reegen   512 Feb  5 11:16 dir1
 -rw-r--r--  1 reegen reegen     0 Feb  5 11:16 file1

 $ umask u=rwx,g=rx,o=
 $ umask -S
 u=rwx,g=rx,o=
 $ touch file2 ; mkdir dir2 ; chgrp friends * ; ls -ld file2 dir2
 drwxr-x---  2 reegen friends  512 Feb  5 11:17 dir2
 -rw-r-----  1 reegen friends    0 Feb  5 11:17 file2