How to Log Users Out of Shell Automatically When They Are Idle

Here, we will be configuring the Bash timeout for one user only.

a) Configuring Bash

Open your ~/.bashrc file on your favorite text editor with appropriate privileges and add or edit the following line. Here, we want to log us out after 2 minutes or 120 seconds of idleness.
TMOUT=120

b) Reloading Configuration

You have to reload this modified configuration by sourcing your ~/.bashrc file.
source ~/.bashrc
And it will take effect immediately.

Documentation

• https://www.gnu.org/software/bash/manual/bash.html#index-TMOUT