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  1. What is Umask and How To Setup Default umask …

    • The user file-creation mode mask (umask) is used to determine the file permission for newly created files. It can be used to control the default file permission for new files. It is a four-digit octal nu… See more

    Procedure to Set Up Default umask on Linux

    You can set up umask in /etc/bashrc or /etc/profile file for all users. By default most Linux distro … See more

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    Umask Examples

    The following example explains how the umask affects the permissions of files and directories on Linux and Unix-like systems. First, note down the default umask permission… See more

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    Summing Up

    For more information about the umask read the man page of bash or ksh or tcsh shell using the man command or help command: $ man bash $ help umask $ man chmod 🥺 Was this h… See more

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    umask (user file-creation mode mask) is a command in Linux that determines the default permissions for newly created files and directories. When you set umask 0027, it modifies the default permissions by masking out certain bits.

    Default Permissions and umask

    By default, directories are created with permissions 777 (rwxrwxrwx), and files are created with permissions 666 (rw-rw-rw-). However, these permissions are modified by the umask value to ensure security and proper access control1.

    Calculating Permissions with umask 0027

    The umask value 0027 means:

    • The first digit 0 is a placeholder indicating an octal number.

    • The second digit 0 means no permissions are removed for the owner.

    • The third digit 2 means write permission is removed for the group.

    • The fourth digit 7 means all permissions (read, write, execute) are removed for others.

    To calculate the final permissions, subtract the umask value from the default permissions:

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