What is umask?
The command umask is used to set the file, directory permissions.
In linux, you can set the file or directory permission for all users by editing /etc/profile (or in /etc/bashrc) file or for specific users by editing their respective ~/.bashrc file.
For files, the default permission settings are 0666 (execute permission is disabled) and for directories it is 0777
To produce symbolic output, you can use umask with -s option
$ umask -s
