mjhjmtu

I can start tmux with simply issuing: "tmux", then by hand, separate the windows to 6:

But how could I automatically start tmux with "X" amount, ex.: 6 of separated windows? So I could work later on ex.: 6 different machines in parallel. Good stuff.

Try this:

tmux new-session ; split-window -h ; split-window -v -p 66 ; split-window -v ; select-pane -t 0 ; split-window -v -p 66 ; split-window -v ;

Also, consider looking at this question: https://stackoverflow.com/questions/5609192/how-to-set-up-tmux-so-that-it-starts-up-with-specified-windows-opened.

The other answer is nice and simple. If you want anything more advanced (e.g. save state that includes window names, current directories and running commands and/or if you have more windows/more complicated layouts) there are a couple plugins available. Here's a quick summary.

Using the tmuxinator plugin, put your pane configuration in a yaml file as described by the documentation, then start with

tmuxinator start [project] -n [name]

Here's a sample yaml file so you get the idea of what it will look like:

 - editor:
 layout: b147,208x73,0,0[208x62,0,0,208x10,0,63104x10,0,63,103x10,105,63]
 panes:
 - vim
 - #empty, will just run plain bash
 - top

There's also the tmux-resurrect plugin (which I personally use). The nice thing is you can set up a tmux session and then hit Ctrl+B (or whatever your prefix key is) followed by Ctrl+S and your layout will be saved to file. To restore Ctrl+B then Ctrl+R.

With tmux-resurect I don't know offhand how to automate the restore so you can start tmux with the layout already loaded (as opposed to starting and then restoring with Ctrl-R). I'm guessing it's possible but I'll leave it to you to figure out if you decide to use this plugin.

EDIT: The Continuum Plugin allows for an automated restore immediately after launching tmux