On Debian 13 with GNOME, you can resize a window using the command line with tools like xdotool or wmctrl. Here’s how you can do it:

1. Install Required Tools

First, ensure you have xdotool and wmctrl installed:

sudo apt update
sudo apt install xdotool wmctrl

2. Find the Window ID

You need the window ID or name of the window you want to resize. Use:

xdotool selectwindow

Click on the window you want to resize, and it will output the window ID.

Alternatively, list all windows:

wmctrl -l

3. Resize the Window

Using xdotool:

xdotool windowsize <window_id> <width> <height>

Replace <window_id> with the ID from the previous step, and <width> and <height> with your desired dimensions.

Using wmctrl:

wmctrl -i -r <window_id> -e 0,<x>,<y>,<width>,<height>

• <x> and <y> are the window’s position (use -1 to keep the current position).
• <width> and <height> are the new dimensions.

4. Example

To resize the active window to 800x600 pixels:

xdotool getactivewindow windowsize 800 600

Or with wmctrl:

wmctrl -i -r $(xdotool getactivewindow) -e 0,-1,-1,800,600

Notes:

• These tools require the window manager to support X11 (not Wayland).
• If you’re using Wayland (default in newer GNOME), these tools may not work. In that case, you’d need to use GNOME extensions or scripts that interact with Wayland.