.bashrc snippet to remind me about running screen/tmux sessions

bashrc_screen_and_tmux_sessions.sh

# check for screen sessions
if [ -d /var/run/screen/S-$USER/ ]; then
    n=$(find  /var/run/screen/S-$USER/ -type p|wc -l)
    if [ $n -gt 0 ]; then
        test x"$TERM" = xscreen && test -n "$WINDOW" \
            && echo "You have $n active screen sessions (and this is one of them)." \
            || echo "You have $n active screen sessions."
    fi
fi

# check for tmux sessions
if [ -x /usr/bin/tmux ]; then
    n=$(tmux list-sessions 2>/dev/null|wc -l)
    if [ $n -gt 0 ]; then
        test x"$TERM" = xscreen && test -n "$TMUX" \
            && echo "You have $n active tmux sessions (and this is one of them)." \
            || echo "You have $n active tmux sessions."
    fi
fi

Now maintained at https://github.com/mgedmin/dotfiles/blob/master/bashrc.screen (but I don't anticipate changes).