This tutorial will show you how to find Linux user’s User UID or GID using command line,

To find a user  UID or GID in Linux,

Use the id command. To find a specific user’s UID, at the Unix prompt, enter:

  id -u username

Replace username with the appropriate user’s username. To find a user’s GID, at the terminal , enter:

  id -g username

If you wish to find out all the groups a user belongs to, instead enter:

  id -G username

If you wish to see the user id (UID) and all groups associated with a user, enter id without any options, as follows:

  id username