Change the default permissions for files and directories
When you create a new file or directory, it will have default permissions. To change the default permissions, use the umask command.
Permissions in octal notation
flag notation rwx
corresponding octal number 421
●Check the current default permissions
| Check the current default permissions [nuy@Lion nuy]$ umask ←Run the "umask" command 0022 ←The default permissions will be displayed Checking permissions on directories and files [nuy@Lion nuy]$ mkdir sampdir ←Create the directory sampdir [nuy@Lion nuy]$ ls -ld sampdir drwxr-xr-x 2 nuy nuy 4096 Sep 12 15:45 sampdir/ ↑Permissions are 777-022=755 [nuy@Lion nuy]$ touch samptxt ←Create the file samptxt [nuy@Lion nuy]$ ls -l samptxt -rw-r--r-- 1 nuy nuy 0 Sep 12 16:00 samptxt ↑Permissions are 666-022=644 |
●Changing the permission value
| [nuy@Lion nuy]$ umask 0002 ←Run the umask command [nuy@Lion nuy]$ mkdir sampdir2 ←Create the directory sampdir2 [nuy@Lion nuy]$ ls -ld sampdir2 drwxrwxr-x 2 nuy nuy 4096 Sep 12 17:00 sampdir2/ ↑Permissions are 777-002=775 [nuy@Lion nuy]$ touch samptxt2 [nuy@Lion nuy]$ ls -l samptxt2 -rw-rw-r-- 1 nuy nuy 0 Sep 12 18:00 samptxt2 ↑Permissions are 666-002=664 |