tmux: tmux 2.7 does not change window name by default

If you set PROMPT_COMMAND, tmux and screen will change window name dynamically.

This is useful for connecting multiple machine via SSH.

• Changing current directory with cd will change window name.
• If PROMPT_COMMAND is set on machine connected via SSH, window name will be changed to hostname of machine connected via SSH.

$ cat ~/.bashrc
<snip>
case ${TERM} in
  screen*)
    export PROMPT_COMMAND='printf "\033k%s:%s\033\\" \
"${HOSTNAME%%.*}" `basename "${PWD/#$HOME/~}"`'
    ;;
  *)
    unset PROMPT_COMMAND
    ;;
esac

tmux 2.7 does not change window name by default as the following.

This is because allow-rename is changed from 1 to 0. This may be for users who want to fix window name when creating window.

Change allow-rename to 1 in ~/.tmux.conf.

set-option -g allow-rename on

tmux 2.7 can change window name dynamically as the following.