Set tmux pane title to short hostname on ssh connections

set-tmux-title.sh

ssh() {
  # grep -w: match command names such as "tmux-2.1" or "tmux: server"
  if ps -p $$ -o ppid= \
    | xargs -i ps -p {} -o comm= \
    | grep -qw tmux; then
    # Note: Options without parameter were hardcoded,
    # in order to distinguish an option's parameter from the destination.
    #
    #                   s/[[:space:]]*\(\( | spaces before options
    #     \(-[46AaCfGgKkMNnqsTtVvXxYy]\)\| | option without parameter
    #                     \(-[^[:space:]]* | option
    # \([[:space:]]\+[^[:space:]]*\)\?\)\) | parameter
    #                      [[:space:]]*\)* | spaces between options
    #                        [[:space:]]\+ | spaces before destination
    #                \([^-][^[:space:]]*\) | destination
    #                                   .* | command
    #                                 /\6/ | replace with destination
    tmux rename-window "$(echo "$@" \
      | sed 's/[[:space:]]*\(\(\(-[46AaCfGgKkMNnqsTtVvXxYy]\)\|\(-[^[:space:]]*\([[:space:]]\+[^[:space:]]*\)\?\)\)[[:space:]]*\)*[[:space:]]\+\([^-][^[:space:]]*\).*/\6/')"
    command ssh "$@"
    tmux set-window-option automatic-rename "on" 1> /dev/null
  else
    command ssh "$@"
  fi
}

Thanks, exactly what I was looking for.... 👍

Is there a way to get the window title to switch when switching panes? or to switch back when i exit the ssh session?

Hi @johnmmcgee
I rewrote the function from above with some help from AI, so that title automatically changes when exiting the ssh session.

# Change tmux window/pane when using ssh so that it shows user@host
ssh() {
  if [ -n "${TMUX:-}" ]; then
    # Extract the destination host from the command arguments
    local dest_user_host=$(
      printf "%s " "$@" | awk 'match($0, /[a-zA-Z0-9_.-]+@[a-zA-Z0-9_.-]+/) {print substr($0,RSTART,RLENGTH)}'
    )

    # Rename tmux window and pane if possible
    (
      set +e  # Continue even if rename fails
      tmux display-message -p "#{pane_id}" > /dev/null && tmux rename-window "$dest_user_host"
      tmux rename-pane "$dest_user_host" 2>/dev/null || true
    ) &> /dev/null

    command ssh "$@"

    # Restore automatic renaming (if enabled)
    tmux set-window-option automatic-rename on > /dev/null 2>&1 || true
  else
    command ssh "$@"
  fi
}

Basically I wrote the awk part and the automatic-rename part. The rest is AI hehe...
For some reason I couldn't make the AI to write those lines 😀

@Goku-San hmm this seems to no longer work at all. when using yours.

@Goku-San hmm this seems to no longer work at all. when using yours.

The command is ssh -i your_pem_file.pem user@host and is should work. You put this function in .zshrc or .bashrc.
The important part is user@host - e.g [email protected]
I made it for this format. If you check at the awk part, specifically the regex, it looks for user@host.
It doesn't matter if it has other arguments or not...

ah yes i see that now and explains why it did not work. I was able to rework the regex and now its working for how i use it. thank you.

Glad you made it work... Cheers...