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I want to set up iTerm2 to pass scroll events to tmux, so I can trivially enter (and exit) scrollback mode for whatever pane is active. Is this possible to do with iTerm2, or automation of some sort, or ...?

7

The mode is referred to as "copy mode" and as long as you're running tmux 1.5 or higher you can add:

setw -g mode-mouse on

to your ~/.tmux.conf file and tmux will automatically enter and exit copy mode when you use the scroll wheel on your mouse.

As a bonus, this option allows you to select the tmux pane with your mouse:

set -g mouse-select-pane on

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