TermLock is a shell script to lock your terminal. It traps signals and interrupts to block Ctrl+C , Ctrl+\ , Ctrl+Z , Ctrl+D, uses a hashed password and can log failed attempts. You may alias it as termlock or lock .
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README.md

termlock

Terminal Lock (TermLock) is a shell script to lock your terminal. It traps signals and interrupts to block Ctrl+C , Ctrl+\ , Ctrl+Z , Ctrl+D, uses a hashed password and can log failed attempts.

http://labs.geody.com/termlock/

Screenshot: GeodyLabs TermLock Terminal Lock Linux screenshot