Shell – Run command in multiple active shells simultaneously

Let me see if I have deciphered your screen configuration correctly:

• You use something like logfile "%t-screen.log" (probably in a .screenrc file) to configure the name of the log file that will be started later.
• You use the title <hostname> (C-a A) screen command to set the title of a new window, or
  you do screen -t <hostname> ssh0 <hostname> to start a new screen session.
• You use the C-a H (C-a :log) screen command to toggle logging to the configured file.

If so, then is nearly equivalent (requires tmux 1.3+ to support #W in the pipe-pane shell command; pipe-pane is available in tmux 1.0+):

• In a configuration file (e.g. .tmux.conf):

  bind-key H pipe-pane -o "exec cat >>$HOME/'#W-tmux.log'"
  

• Use tmux rename-window <hostname> (C-b ,) to rename an existing window, or
  use tmux new-window -n <hostname> 'ssh <hostname>' to start a new tmux window, or
  use tmux new-session -n <hostname> 'ssh <hostname>' to start a new tmux session.
• Use C-b H to toggle the logging.

There is no notification that the log has been toggled, but you could add one if you wanted:

bind-key H pipe-pane -o "exec cat >>$HOME/'#W-tmux.log'" \; display-message 'Toggled logging to $HOME/#W-tmux.log'

Note: The above line is shown as if it were in a configuration file (either .tmux.conf or one you source). tmux needs to see both the backslash and the semicolon; if you want to configure this from the a shell (e.g. tmux bind-key …), then you will have to escape or quote both characters appropriately so that they are delivered to tmux intact. There does not seem to be a convenient way to show different messages for toggling on/off when using only a single binding (you might be able to rig something up with if-shell, but it would probably be ugly). If two bindings are acceptable, then try this:

bind-key H pipe-pane "exec cat >>$HOME/'#W-tmux.log'" \; display-message 'Started logging to $HOME/#W-tmux.log'
bind-key h pipe-pane \; display-message 'Ended logging to $HOME/#W-tmux.log'

This is what I did:

alias ta='export NEW_SESSION=\$(uuidgen) ; tmux new-session -t 0 -s \$NEW_SESSION ; tmux kill-session -t \$NEW_SESSION'

What this does is create a new session from session named '0' (what the first session is named if you don't specify), named something uniquely random (using uuidgen) and then kill it when I detach.

Note that I'm using zsh. 'ta' is short for 'tmux attach'