There is no difference between umask 0022 and umask 022. The octal umasks are calculated via the bitwise AND of the unary complement of the argument using bitwise NOT.
umask works by doing a Bitwise AND with the bitwise complement (where the bits are inverted, i.e. 1 becomes 0 and 0 becomes 1) of the umask. The bits which are set in the umask value, refer to the permissions, which are not assigned by default, as these values are subtracted from the maximum permission for files/directories.
The bits which are set in the umask value, refer to the permissions, which are not assigned by default, as these values are subtracted from the maximum permission for files/directories. How to calculate umask value? pratyay@pratyay-ROG-Strix-G531GT:~/Study/Linux/CommandTrials/umask$ umask 0002
We can set and update the default umask value using the command umask followed by a parameter, which should be an integer ranging from 000-777. The syntax for updating the umask value is the same as setting the umask value.
The umask command specifies the permissions that the user does not want to be given out to the newly created file or directory.
Here, the first digit, 0 is called the sticky bit, it is a special security feature.
We can set and update the default umask value using the command umask followed by a parameter, which should be an integer ranging from 000-777. The syntax for updating the umask value is the same as setting the umask value.
Here, when we execute the command, the values are not directly allocated as 5 for the owner, 4 for the group members and 3 for the others, but the value we pass as an argument is subtracted from the max/full permission set. There are two full permission sets:
The umask command can be only used on new files i.e. while creating new files, any files created prior to using the umask command will have no effect.