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In order to resize tmux panes, you first hit your tmux prefix ( ctrl + b is the default one. Mine is ctrl + a .), and then the colon key : . This brings up a tmux command mode prompt at the bottom of your screen. All done!
To resize tmux panes, you'll first want to hit your prefix — ctrl + b by default — and then the colon key :. What this does is brings up a prompt at the bottom of your screen. Now you'll want to type in resize-pane in the prompt, followed by a hyphen - and either D, U, L, R.
In Terminal. app you can change it by going to Terminal > Preferences > Profiles > Keyboard : check the "Use Option as Meta Key". Now you can type ctrl-b option-↑ to increase the size or ctrl-b option-↓ to decrease the size and you don't have to remap the mission control keys.
To switch cursors between the two panes, use " ctrl-b + LEFT ", " ctrl-b + RIGHT ", " ctrl-b + UP " and " ctrl-b + DOWN " to go left, right, up, and down the panes, respectively.
What about Ctrl-B then (pressing Ctrl) + arrow?
If in tmux < 1.8, doing this by Ctrl-B then (Esc + arrow) * n, where n is the number of times you want to resize.
In tmux 1.8, the size of the panes may be adjusted interactively. Under the default key bindings this may be done by the prefix key (C-b) followed by the meta key combined with arrow keys (M-arrow), where arrow is one of the up/down/left/right arrow keys.
E.g. Ctrl-b followed by Alt-Up will adjust the size upwards.
Note that the Alt key may be held down while the up/down/left/right keys are pressed multiple times to make multiple adjustments.
E.g. Ctrl-b followed by Alt-Up-Up-Left will adjust the size upwards by two movements and left by one movement.
usage: resize-pane [-DLRUZ] [-x width] [-y height] [-t target-pane] [adjustment]
ie.
resize-pane -t 1 -y 5
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