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  • What is umask command?

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    Umask is a number which define the default permissions that is not given on a file or any directory.


    How to Calculate Umask:

    We can subtract the umask from the base permissions to determine the final permission to any file. Please see below example for more :-

    Let's suppose umask 000 It means that User has 0, Group has 0 and other has 0 permission. Now folder permission calculated as :-

    User permission is      7-0 =7 (Read, Write and Execute)
    Group Permission is   7-0 =7 (Read, Write and Execute)
    Other Permission is    7-0 =7 (Read, Write and Execute)
    

    Suppose umask 002 It means that User has 0, Group has 0 and other has 2 permission. Now folder permission calculated as :-

    User permission is     7-0 =7 (Read, Write and Execute)
    Group Permission is   7-0 =7 (Read, Write and Execute)
    Other Permission is    7-2 =5 (Read and Execute)
    

    Suppose umask 022 It means that User has 0, Group has 2 and other has 2 permission Now folder permission calculated as :-

    User permission is      7-0 =7 (Read, Write and Execute)
    Group Permission is   7-2 =5 (Read and Execute)
    Other Permission is    7-2 =5 (Read and Execute)
    

    Suppose umask 027 means User has 0, Group has 2 and other has 2. Now folder permission calculated as :-

    User permission is      7-0 =7 (Read, Write and Execute)
    Group Permission is   7-2 =5 (Read and Execute)
    Other Permission is    7-7 =0 (No permission)
    

    Note : - To Find umask value use below command .

    $ umask
    output - 0022
    

    To change Umask use this command .

    $ umask 072
    

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