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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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  3. 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 …

  4. People also ask
    What is umask in Linux?On Linux and Unix operating systems, all new files are created with a default set of permissions. The umask utility allows you to view or to set the file mode creation mask, which determines the permissions bits for newly created files or directories. It is used by mkdir, touch, tee , and other commands that create new files and directories.
    How to set a system-wide umask in Linux?Thus, Linux has the umask command based on the umask () system call. In this tutorial, we take a deep dive into umask and explore how to set a system-wide umask. First, we go over the way Linux handles default file permissions. Next, we extrapolate the usual base permissions set. After that, we check how umask augments these settings for new files.
    What are some examples of umask commands?Here are some other example umask commands: Sets the mask so that new files allows all users to read them; other permissions will be unchanged from the default. Sets the mask so that new files will not initially be executable by any user; other default permissions unchanged from defaults.
    How do I set umask in Linux?umask affects only the current shell environment. On most Linux distributions, the default system-wide umask value is set in the pam_umask.so or /etc/profile file. 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.
    How does umask work?A user can choose how to restrict permissions by using a permissions mask. A permission mask interacts with the default system permissions and changes them. The umask command is used to apply this mask.
    What is umask value?The umask value contains the permission bits that will NOT be set on the newly created files and directories. As we have already mentioned, the default creation permissions for files are 666 and for directories 777. To calculate the permission bits of the new files, subtract the umask value from the default value.
  5. WEBNov 6, 2021 · The umask command is used to set this mask, or to show you its current value. Syntax. umask [-S] [ mask] Options. What are permissions, and how do they work?

  6. WEBMay 11, 2024 · Use the umask command to set default file permissions on Linux and Unix-like machines. Finding the current shell’s umask value. The umask command without any arguments will display the current value of …

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