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Where is umask from?
Where the umask setting comes from. The umask setting for all users is generally set up in a system-wide file like /etc/profile, /etc/bashrc or /etc/login. defs — a file that’s used every time someone logs into the system. The setting can be overidden in user-specific files like ~/.
How do you find the umask value?
To determine the umask value you want to set, subtract the value of the permissions you want from 666 (for a file) or 777 (for a directory). The remainder is the value to use with the umask command. For example, suppose you want to change the default mode for files to 644 ( rw-r–r– ).
What does umask 007 mean?
With umask 007, directories will have permission 770 and new files will have permission 660. The net effect is that new DataStage files and directories (primarily files created for new jobs in the project directories) will no longer be public readable.
What is the umask value of a file?
It is a kind of filter wherein we can choose to retain or block some of the default permissions from being applied on the file. Say, the umask value is 0022. umask is by default displayed in Octal form, and hence the first 0 in the umask value is the indication for octal value. So, the actual umask is 022.
What does the first digit in umask mean?
The first digit represents the special permissions, and if it is omitted, it means that no special permissions are set on the file. In our example 755 is the same as 0755. The first digit can be a combination of 4 for setuid, 2 for setgid, and 1 for Sticky Bit.
What does the octal value of R stand for in umask?
The first sets show the owner permissions, the second one group permissions, and the last set shows everybody else permissions. Character r with an octal value of 4 stands for read, w with an octal value of 2 for write, x with an octal value of 1 for execute permission, and ( -) with an octal value of 0 for no permissions.
How can I change the mask value in umask?
If you want to specify a different value on a per-user basis, edit the user’s shell configuration files such as ~/.bashrc or ~/.zshrc. You can also change the current session umask value by running umask followed by the desired value. To view the current mask value, simply type umask without any arguments: