Bash - add user to exiting group in Linux

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In this short article we want to show how in Linux, add user to exiting group using Bash (or any Command Line).

Quick solution:

sudo usermod -a -G group_name user_name

What will cause the user_name user will have attached additional group_name group.


  • in Linux each user is assignet to main group and additional groups,
  • run usermod command as super user.


  • -a means add operation,
  • -G means additional group.

Practical example

Type following command:

usermod -a -G sudo john


root@debian# groups john
john : john sudo

Note: we can see now john is assigned to sudo group too.

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