I just wanted to know what version of tmux I'm running...

whatversionoftmuxamirunning.txt

$ tmux --version
tmux: illegal option -- -
usage: tmux [-2CluvV] [-c shell-command] [-f file] [-L socket-name]
            [-S socket-path] [command [flags]]

$ tmux --help
tmux: illegal option -- -
usage: tmux [-2CluvV] [-c shell-command] [-f file] [-L socket-name]
            [-S socket-path] [command [flags]]

$ tmux -help
tmux: illegal option -- h
usage: tmux [-2CluvV] [-c shell-command] [-f file] [-L socket-name]
            [-S socket-path] [command [flags]]

$ tmux -h
tmux: illegal option -- h
usage: tmux [-2CluvV] [-c shell-command] [-f file] [-L socket-name]
            [-S socket-path] [command [flags]]

$ tmux version
unknown command: version

$ tmux help
unknown command: help

$ tmux commands
unknown command: commands

$ screen --help
Use: screen [-opts] [cmd [args]]
 or: screen -r [host.tty]

Options:
-a            Force all capabilities into each window's termcap.
-A -[r|R]     Adapt all windows to the new display width & height.
-c file       Read configuration file instead of '.screenrc'.
-d (-r)       Detach the elsewhere running screen (and reattach here).
-dmS name     Start as daemon: Screen session in detached mode.
-D (-r)       Detach and logout remote (and reattach here).
-D -RR        Do whatever is needed to get a screen session.
-e xy         Change command characters.
-f            Flow control on, -fn = off, -fa = auto.
-h lines      Set the size of the scrollback history buffer.
-i            Interrupt output sooner when flow control is on.
-list         or -ls. Do nothing, just list our SockDir.
-L            Turn on output logging.
-m            ignore $STY variable, do create a new screen session.
-O            Choose optimal output rather than exact vt100 emulation.
-p window     Preselect the named window if it exists.
-q            Quiet startup. Exits with non-zero return code if unsuccessful.
-r            Reattach to a detached screen process.
-R            Reattach if possible, otherwise start a new session.
-s shell      Shell to execute rather than $SHELL.
-S sockname   Name this session <pid>.sockname instead of <pid>.<tty>.<host>.
-t title      Set title. (window's name).
-T term       Use term as $TERM for windows, rather than "screen".
-U            Tell screen to use UTF-8 encoding.
-v            Print "Screen version 4.00.03 (FAU) 23-Oct-06".
-wipe         Do nothing, just clean up SockDir.
-x            Attach to a not detached screen. (Multi display mode).
-X            Execute <cmd> as a screen command in the specified session.

$ screen -v
Screen version 4.00.03 (FAU) 23-Oct-06

As this turned up when I searched for a solution myself, here is the way to do it:

$ tmux -V
tmux 3.1b

This gist is literary art.
Also -V when I look at it most other places means --verbose as in verbose logging. If I'm trying to avoid starting a tmux session tmux -V is the absolute last thing I'm going to try.

Thank you.

Who comes up with such a flag for version! 🤦🏻‍♂️

Slow clap 👏