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    Upvotes21Top Answeredited May 23, 2017 at 12:40

    Assume the default mask of 0666. umask 0022 would make the new mask 0644 (0666-0022=0644) meaning that group and others have read (no write or execute) permissions.

    The "extra" digit (the first number = 0), specifies that there are no special modes.

    If mode begins with a digit it will be interpreted as octal otherwise its meant to be symbolic.

    0 is ...

    4000 = SUID
    2000 = SGID
    1000 = sticky bit

    The SUID bit, short for set-user-ID, causes an executable program to run with the effective user id (uid) of the owner -- in other words, no matter who executes ...

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    How to set umask in Linux?For example, the .bashrc file which is located under the current user home directory can be used to set umask. First, open the ~/.bashrc and put the following line at the end of the line. This configuration also makes the Umask value persistent where even the system reboots the value stays the same.
    What is a 'umask' value?The value associated with umask is NOT the permission you get for your files and directories. There is a very simple calculation. As we mentioned above that the default value for a file is 666 and for a directory, it’s 777. To calculate permission bits for new files or directories, subtract the umask value from the default value.
    How do I set the umask value?You can set the umask value through the umask command. The string specifying the mode mask follows the same syntactic rules as the mode argument of chmod (see the POSIX Programmer's Manual for details).
    wiki.archlinux.org
    What is a 'umask' command?In this example, the ‘umask’ command sets the default permissions to ‘750’ for directories and ‘640’ for files. This means that the user has read, write, and execute permissions, the group has read and execute permissions, and others have no permissions. The ‘027’ value is a mask that determines the permissions for user, group, and others.
    How to use 'umask' in a shell script?Here’s an example of how ‘umask’ can be used in a shell script: In this script, the ‘umask’ command sets the default permissions to ‘600’ for files and ‘700’ for directories. This means that only the user has read and write permissions for files and read, write, and execute permissions for directories.
    What should I consider when using umask?When using umask, you should keep the following two considerations in view: Effect of umask The umask subtracts permissions from the system defaults, typically 666 for files (rw-rw-rw-) and 777 for directories (rwxrwxrwx). Thus, a umask of 022 results in new files having permissions of 644 (rw-r–r–) and new directories 755 (rwxr-xr-x).
  4. WebJul 28, 2022 · Linux allows some processes to inherit system umask values, or to be given their own umask settings. For example, useradd uses a umask setting to create new users' home directories. A umask value …

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  5. WebMay 11, 2024 · But, how do I calculate umask value under Linux? The octal umasks are calculated via the bitwise AND of the unary complement of the argument using bitwise NOT. The octal notations are as follows:

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