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unset command

How to undefine and unset a bash environment variable on Linux or Unix

I have set the shell variable. I no longer need the variable. How do I undefine or unset a variable in bash on a Linux or Unix-like desktop system?
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HowTo: Linux / UNIX Unset TMOUT ( AutoLogOut )

I‘ve set the the TMOUT in the ~/.profile of the user account as well as in /etc/profile file on my UNIX or Linux servers. How do I unset the TMOUT variable? How to unset TMOUT temporarily under UNIX like operating systems?
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