This article covers how to use the umask command in Linux. In fact, the umask command alters the default permissions on newly created files and directories.

How to fix umask: command not found Linux error ?

If you encounter the below error while executing the umask command:

$ umask: command not found

You can install it to your system by running the respective commands:

For OS X, simply run the command:

$ brew install bash

For Debian, run the below command:

$ apt-get install execline

For Ubuntu, run the command:

$ apt-get install execline

For Alpine, run the below command:

$ apk add bash

For Arch Linux, run the below command:

$ pacman -S bash

For Kali Linux, run the below command:

$ apt-get install execline

For CentOS, run the below command:

$ yum install bash

For Fedora, execute the command:

$ dnf install bash

For Raspbian, run the command:

$ apt-get install bash

Different ways of using umask Command:

1. Display the current mask in octal notation:

$ umask

2. Display the current mask in symbolic (human-readable) mode:

$ umask -S

3. Change the mask symbolically to allow read permission for all users (the rest of the mask bits are unchanged):

$ umask a+r

4. Set the mask (using octal) to restrict no permissions for the file's owner, and restrict all permissions for everyone else:

$ umask 077