Why do I have multiple tmux processes?

Question

I use tmux attach to start tmux and have the following lines in my tmux.conf:

new  -n TeX   bash
neww -n Shell bash

After starting the terminal emulator and running pgrep I get the following:

 ~  $ pgrep -lL tmux
41479 /Users/nmk/.homebrew/bin/tmux attach
41481 /Users/nmk/.homebrew/bin/tmux attach

The tmux session I see is 0. What is the second process doing? Are those two the client and the server?

Answer 1

Yes, one is the server. If you do ps x you'll see that one is attached to a pty and one isn't. If you run another separate tmux session, you'll see three processes - two with ptys and one, the server, without.