xdotool:tldr:0e430

The command xdotool getactivewindow is used in Linux to retrieve the currently active window on the desktop.

Here's how it works:

• xdotool is a command-line tool used for simulating keyboard input and mouse activity in Linux.
• getactivewindow is an argument passed to xdotool to indicate that we want to retrieve the currently active (focused) window on the desktop.

When you run this command, it makes use of X11 (the default display server protocol in most Linux systems), fetches the currently active window ID, and prints it to the console. Windows in X11 have unique IDs associated with them, and this command helps you retrieve that ID.

This command can be useful in various scenarios, such as when you need to perform automation or scripting tasks involving specific windows, or when you want to manipulate the active window using other xdotool commands.