Many users (including system administrators) leave their logged in Linux shell open and leave their desk. There is no lock screen option if you are running your Linux box in pure CLI mode so any sneaker can access your documents, the situation is worse if a root user leaves his session as the sneaker can poke their nose into the whole system and do whatever they want.
Luckily there is an environment variable in BASH called TMOUT by using you can instruct the shell to exit (or logout) if it is idle for the given seconds. Note the shell will only exit if it is idle that is no actively running program like vi editor session. Use the following in your ~/.bash_profile file to make this permanent.
This is will make the shell to exit automatically if left idle for 300 seconds (5 minutes)
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