This example shows how to terminate all active tmux and screen sessions via shell commands. It first lists tmux sessions, extracts session IDs by filtering lines containing colons, trimming with `cut`, and stripping trailing characters using `awk` and `substr`, then pipes them to `xargs kill`. For screen, it filters lines containing "Detached", parses the session identifier with `cut` and `awk`, and kills those processes similarly. The code relies on standard Unix utilities including `tmux`, `screen`, `grep`, `cut`, `awk`, `xargs`, and `kill`.