How to optimally start *tmux* in every Termux session?

[ghost]

I've tmux installed and want to launch it with every Termux session. A suggestion shared by the /r/termux moderator doesn't work (I've restarted; I don't see other relevant info).

Add to ~/.zlogin end:

if [ -z "$TMUX" ]; then
exec tmux
fi

Checking for $TMUX variable is done to ensure that no nested tmux instance will be started on login shells. exec will replace current process with a new one, i.e. current shell will be terminated and tmux instance with shell inside will be started, so you won't need to exit twice.

---

see for Linux in general: https://unix.stackexchange.com/questions/43601/how-can-i-set-my-default-shell-to-start-up-tmux

[sylirre]

~/.zlogin specific to zsh shell but default shell of Termux is bash. It uses ~/.bash_profile, in this file you can add:

# Don't run code below if shell is non-interactive
[[ $- != *i* ]] && return

# Start tmux if not running already in current shell session.
if [ -z "$TMUX" ]; then
    exec tmux
fi

If you want all Termux sessions to share single tmux instance use this instead:

# Don't run code below if shell is non-interactive
[[ $- != *i* ]] && return

# If not already under tmux, try attaching to existing instance. If no tmux instance exist, start new.
if [ -z "$TMUX" ]; then
    tmux attach 2>/dev/null || tmux
    exit
fi

Side effect of using single tmux instance: ctrl-d will terminate all Termux sessions if tmux had only one.

[ghost]

Sorry for confusing the shells. The top answer on unix.stackexchange.com is also functional (restart Termux after saving).