Tmux Part 3: Navigation

@eternal44 my guess is that this is a version issue. It looks like the -A flag was added to the new-session command in version 1.8 (March 2013).

You can check your version by running tmux -V (note the big v). Should be 1.8 or higher to work with tat, but I’d recommend upgrading to 1.9a or 2.0 via your package manager anyway.

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