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I have tmux installed with iTerm2 on OS X.

While I can do Cmd+left/right to switch between tabs, I cannot seem to be able to switch between panes under the same tab using Ctl+b o (that is, Control and b together, followed by an o?) as suggested by others.

I don't think I've touched any default key binding for tmux, so what is the correct keyboard shortcut for this operation?

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You can see a list of all your bindings using Ctl+b ?. You're looking for the following line:

bind-key          o select-pane -t :.+

although it sounds as if you may have a key other than 'o' bound to it.

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Cmd + Opt + Up or Down or Left or Right works for me.

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