I am having lots of issues with tmux on Mac.

One problem I have is that I cannot bind a key in my tmux.conf to resize my panes.

What I need is the CTRL-b: resize-pane -U 10 I currently do to increase the size of the pane upwards ten cells (or downwards or left or right) to be done by a key shortcut and not to actually have to type this over and over (which I currently do unfortunately).

But I can not find a way to configure this since on Mac, it seems that CTRL and other keys work diffently than on Linux.

Can anyone please help me out?


Below are my keybindings that let me resize a pane.

It uses Alt + direction, where the keys for the directions are known from Vim:

h l 
# Resize the current pane using Alt + direction
bind -n M-k resize-pane -U 5
bind -n M-j resize-pane -D 5
bind -n M-h resize-pane -L 5
bind -n M-l resize-pane -R 5

In ~/.tmux.conf:

bind e resize-pane -U 10

Then, tmux source-file ~/.tmux.conf. (another useful shortcut: use the same principle).

  • 2
    1) So bind e resize-pane -U 10 is one line in tmux that binds the key e with the resize? Should I have pressed the ctrl-b before e? 2) I am not sure what you mean with tmux source-file ~/.tmux.conf. Doesn't tmux read the home directory's conf file?
    – Jim
    Jul 4 '13 at 19:43
  • @Jim: Yes, you hit the prefix key first. Then e. Yes, tmux does that, but it is faster to have it as a shortcut as well, so you don't have to restart tmux every time you make an improvement/extension in/to the init file. Jul 4 '13 at 19:44
  • So tmux source-file ~/.tmux.conf is another line in tmux.conf?
    – Jim
    Jul 4 '13 at 19:46
  • @Jim: No, that would be something you type. In the init file, it could look like this: bind u source-file ~/.tmux.conf if you want this for u. Jul 4 '13 at 19:50
  • 1
    why are you using bind and not bind-key? Jan 28 '16 at 22:04

There is already a shortcut: Hold down Ctrl, press b and then adjust the size with , etc. without releasing Ctrl.

Also, with

set -g mouse on

in ~/.tmux.conf you do it with the mouse. But with this setting active you need to hold Shift to do selections and paste with the scroll wheel.

  • 1
    doesnt work on mac unfortunately as ctrl+direction brings up mac window switcher Feb 6 at 11:31
  • 2
    Hey @JimmyMGLim , if you want you can disable ctrl+arrows shortcuts on MacOS: go to "Preferences -> Keyboard -> Shortcut -> Mission Control" and remove the checks on all four ctrl+arrow lines. I did it (I don't use those OS shortcuts anyway) and it works great. :) apple.stackexchange.com/questions/18043/… Mar 2 at 15:22
  • Is there a way to make this faster? this approach takes forever to make big adjustments.
    – azizj
    Mar 16 at 14:20
  • @azizj1 I updated the answer. Mar 26 at 19:41

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