🐇 While checking macos-option-as-alt as a potential source of the problem, I spent time adjusting the Ghostty icon. I changed the app icon. This is how I spend my time being extremely productive.

🐢 Weird. The Option as alt key setting is fine.

🐇 Actually, the Alt key works; the reason we cannot make panes larger is that Alt-Right and Alt-Left are not bound to this.

🐢 You may be right, yes. Then, what’s the key to enlarge a pane?

🦊 List all the keys. Check the keys. You should have done this already.

$ tmux list-keys | rg resize

bind-key    -T prefix       >                      display-menu -T "#[align=centre]#{pane_index} (#{pane_id})" -x P -y P "#{?#{m/r:(copy|view)-mode,#{pane_mode}},Go To Top,}" < { send-keys -X history-top } "#{?#{m/r:(copy|view)-mode,#{pane_mode}},Go To Bottom,}" > { send-keys -X history-bottom } '' "#{?mouse_word,Search For #[underscore]#{=/9/...:mouse_word},}" C-r { if-shell -F "#{?#{m/r:(copy|view)-mode,#{pane_mode}},0,1}" "copy-mode -t=" ; send-keys -X -t = search-backward "#{q:mouse_word}" } "#{?mouse_word,Type #[underscore]#{=/9/...:mouse_word},}" C-y { copy-mode -q ; send-keys -l "#{q:mouse_word}" } "#{?mouse_word,Copy #[underscore]#{=/9/...:mouse_word},}" c { copy-mode -q ; set-buffer "#{q:mouse_word}" } "#{?mouse_line,Copy Line,}" l { copy-mode -q ; set-buffer "#{q:mouse_line}" } '' "#{?mouse_hyperlink,Type #[underscore]#{=/9/...:mouse_hyperlink},}" C-h { copy-mode -q ; send-keys -l "#{q:mouse_hyperlink}" } "#{?mouse_hyperlink,Copy #[underscore]#{=/9/...:mouse_hyperlink},}" h { copy-mode -q ; set-buffer "#{q:mouse_hyperlink}" } '' "Horizontal Split" h { split-window -h } "Vertical Split" v { split-window -v } '' "#{?#{>:#{window_panes},1},,-}Swap Up" u { swap-pane -U } "#{?#{>:#{window_panes},1},,-}Swap Down" d { swap-pane -D } "#{?pane_marked_set,,-}Swap Marked" s { swap-pane } '' Kill X { kill-pane } Respawn R { respawn-pane -k } "#{?pane_marked,Unmark,Mark}" m { select-pane -m } "#{?#{>:#{window_panes},1},,-}#{?window_zoomed_flag,Unzoom,Zoom}" z { resize-pane -Z }
bind-key    -T prefix       z                      resize-pane -Z
bind-key -r -T prefix       M-Up                   resize-pane -U 5
bind-key -r -T prefix       M-Down                 resize-pane -D 5
bind-key -r -T prefix       M-Left                 resize-pane -L 5
bind-key -r -T prefix       C-Up                   resize-pane -U
bind-key -r -T prefix       C-Down                 resize-pane -D
bind-key -r -T prefix       C-Left                 resize-pane -L
bind-key -r -T prefix       C-Right                resize-pane -R
bind-key    -T root         MouseDown3Pane         if-shell -F -t = "#{||:#{mouse_any_flag},#{&&:#{pane_in_mode},#{?#{m/r:(copy|view)-mode,#{pane_mode}},0,1}}}" { select-pane -t = ; send-keys -M } { display-menu -T "#[align=centre]#{pane_index} (#{pane_id})" -t = -x M -y M "#{?#{m/r:(copy|view)-mode,#{pane_mode}},Go To Top,}" < { send-keys -X history-top } "#{?#{m/r:(copy|view)-mode,#{pane_mode}},Go To Bottom,}" > { send-keys -X history-bottom } '' "#{?mouse_word,Search For #[underscore]#{=/9/...:mouse_word},}" C-r { if-shell -F "#{?#{m/r:(copy|view)-mode,#{pane_mode}},0,1}" "copy-mode -t=" ; send-keys -X -t = search-backward "#{q:mouse_word}" } "#{?mouse_word,Type #[underscore]#{=/9/...:mouse_word},}" C-y { copy-mode -q ; send-keys -l "#{q:mouse_word}" } "#{?mouse_word,Copy #[underscore]#{=/9/...:mouse_word},}" c { copy-mode -q ; set-buffer "#{q:mouse_word}" } "#{?mouse_line,Copy Line,}" l { copy-mode -q ; set-buffer "#{q:mouse_line}" } '' "#{?mouse_hyperlink,Type #[underscore]#{=/9/...:mouse_hyperlink},}" C-h { copy-mode -q ; send-keys -l "#{q:mouse_hyperlink}" } "#{?mouse_hyperlink,Copy #[underscore]#{=/9/...:mouse_hyperlink},}" h { copy-mode -q ; set-buffer "#{q:mouse_hyperlink}" } '' "Horizontal Split" h { split-window -h } "Vertical Split" v { split-window -v } '' "#{?#{>:#{window_panes},1},,-}Swap Up" u { swap-pane -U } "#{?#{>:#{window_panes},1},,-}Swap Down" d { swap-pane -D } "#{?pane_marked_set,,-}Swap Marked" s { swap-pane } '' Kill X { kill-pane } Respawn R { respawn-pane -k } "#{?pane_marked,Unmark,Mark}" m { select-pane -m } "#{?#{>:#{window_panes},1},,-}#{?window_zoomed_flag,Unzoom,Zoom}" z { resize-pane -Z } }
bind-key    -T root         MouseDrag1Border       resize-pane -M
bind-key    -T root         M-MouseDown3Pane       display-menu -T "#[align=centre]#{pane_index} (#{pane_id})" -t = -x M -y M "#{?#{m/r:(copy|view)-mode,#{pane_mode}},Go To Top,}" < { send-keys -X history-top } "#{?#{m/r:(copy|view)-mode,#{pane_mode}},Go To Bottom,}" > { send-keys -X history-bottom } '' "#{?mouse_word,Search For #[underscore]#{=/9/...:mouse_word},}" C-r { if-shell -F "#{?#{m/r:(copy|view)-mode,#{pane_mode}},0,1}" "copy-mode -t=" ; send-keys -X -t = search-backward "#{q:mouse_word}" } "#{?mouse_word,Type #[underscore]#{=/9/...:mouse_word},}" C-y { copy-mode -q ; send-keys -l "#{q:mouse_word}" } "#{?mouse_word,Copy #[underscore]#{=/9/...:mouse_word},}" c { copy-mode -q ; set-buffer "#{q:mouse_word}" } "#{?mouse_line,Copy Line,}" l { copy-mode -q ; set-buffer "#{q:mouse_line}" } '' "#{?mouse_hyperlink,Type #[underscore]#{=/9/...:mouse_hyperlink},}" C-h { copy-mode -q ; send-keys -l "#{q:mouse_hyperlink}" } "#{?mouse_hyperlink,Copy #[underscore]#{=/9/...:mouse_hyperlink},}" h { copy-mode -q ; set-buffer "#{q:mouse_hyperlink}" } '' "Horizontal Split" h { split-window -h } "Vertical Split" v { split-window -v } '' "#{?#{>:#{window_panes},1},,-}Swap Up" u { swap-pane -U } "#{?#{>:#{window_panes},1},,-}Swap Down" d { swap-pane -D } "#{?pane_marked_set,,-}Swap Marked" s { swap-pane } '' Kill X { kill-pane } Respawn R { respawn-pane -k } "#{?pane_marked,Unmark,Mark}" m { select-pane -m } "#{?#{>:#{window_panes},1},,-}#{?window_zoomed_flag,Unzoom,Zoom}" z { resize-pane -Z }

🐇 resize-pane has keys, but they conflict with C-Right, etc., which are macOS display selection keys. I defined M-S-Right, etc., to resize and M-C-Right, etc., to swap the panes. Defining new keys with M-S…

bind-key -n "M-S-Right" resize-pane -R 10
bind-key -n "M-S-Left" resize-pane -L 10
bind-key -n "M-S-Up" resize-pane -U 10
bind-key -n "M-S-Down" resize-pane -D 10

🐢 We can set keys to swap windows too, maybe to M-C-PageDown, etc. M-PageDown now moves between windows.

🐇 Let’s take a look at the command options:

     swap-window [-d] [-s src-window] [-t dst-window]
                   (alias: swapw)
             This is similar to link-window, except the source and destination windows are swapped.  It is an error if no window exists at src-window.  If -d is given, the new window
             does not become the current window.

             If -s is omitted and a marked pane is present (see select-pane -m), the window containing the marked pane is used rather than the current window.

🐢 The use case will be limited, though.

🐇 Umm, right. Let’s stop procrastinating here.

🐢 It was productive procrastination, though. Now I can resize my tmux panes.

On macOS:

sudo lsof -i -P | grep LISTEN | grep :$PORT

And on Linux:

netstat -pntl | grep $PORT