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I am trying to set up my computer (running Crunchbang Linux Waldorf and i3) so that it is always, by default, configured so that pressing Ctrl + Shift and arrow keys resizes the window according to the direction of the arrows.

The i3 user guide provides this example which I think is very close to what I want:

mode "resize" {

    # These bindings trigger as soon as you enter the resize mode



    # Pressing left will shrink the window’s width.

    # Pressing right will grow the window’s width.

    # Pressing up will shrink the window’s height.

    # Pressing down will grow the window’s height.

    bindsym j           resize shrink width 10 px or 10 ppt

    bindsym k           resize grow height 10 px or 10 ppt

    bindsym l           resize shrink height 10 px or 10 ppt

    bindsym semicolon   resize grow width 10 px or 10 ppt



    # same bindings, but for the arrow keys

    bindsym Left        resize shrink width 10 px or 10 ppt

    bindsym Down        resize grow height 10 px or 10 ppt

    bindsym Up          resize shrink height 10 px or 10 ppt

    bindsym Right       resize grow width 10 px or 10 ppt



    # back to normal: Enter or Escape

    bindsym Return mode "default"

    bindsym Escape mode "default"

}



# Enter resize mode

bindsym $mod+r mode "resize"

But I want to build it in natively, without having to enter and exit resize modes. I just want to use arrow keys, not j,k,l and semicolon keys.

Any thoughts on how I would do that?

Best solution that I have figured out myself:

Go to ~/.i3/config and open the file.

Paste following code at the end:

bindsym $mod+Ctrl+Right resize shrink width 1 px or 1 ppt

bindsym $mod+Ctrl+Up resize grow height 1 px or 1 ppt

bindsym $mod+Ctrl+Down resize shrink height 1 px or 1 ppt

bindsym $mod+Ctrl+Left resize grow width 1 px or 1 ppt

Save it and restart i3.

Base on the @Oposum's solution, I added a "fast resize" :

# Resizing windows by 10 in i3 using keyboard only

bindsym $mod+Ctrl+Shift+Right resize shrink width 10 px or 10 ppt

bindsym $mod+Ctrl+Shift+Up resize grow height 10 px or 10 ppt

bindsym $mod+Ctrl+Shift+Down resize shrink height 10 px or 10 ppt

bindsym $mod+Ctrl+Shift+Left resize grow width 10 px or 10 ppt

So in my ~/.i3/config I have:

# Resizing windows in i3 using keyboard only

# https://unix.stackexchange.com/q/255344/150597



# Resizing by 1

bindsym $mod+Ctrl+Right resize shrink width 1 px or 1 ppt

bindsym $mod+Ctrl+Up resize grow height 1 px or 1 ppt

bindsym $mod+Ctrl+Down resize shrink height 1 px or 1 ppt

bindsym $mod+Ctrl+Left resize grow width 1 px or 1 ppt



# Resizing by 10

bindsym $mod+Ctrl+Shift+Right resize shrink width 10 px or 10 ppt

bindsym $mod+Ctrl+Shift+Up resize grow height 10 px or 10 ppt

bindsym $mod+Ctrl+Shift+Down resize shrink height 10 px or 10 ppt

bindsym $mod+Ctrl+Shift+Left resize grow width 10 px or 10 ppt

As @Oposum said : Save it and restart i3 ($mod+Shift+R).

Hope this small addition could help too.