Linux · Process Management

A graphical window is frozen and you'd rather point-and-click than hunt for its PID. Which command lets you do that, and what's the hard requirement?

Answer locked. Get the free KnowCard app to reveal it — plus spaced-repetition review so it actually sticks.

This is one card from the KnowCard library — thousands more across SAP, Linux, Python and more. In the app you get the answer, AI explanations, and cards that come back right before you would forget them. Free to start on iOS, Android or the web.

More in Process Management

On Linux, what single file attribute distinguishes a runnable program from an ordinary data file, and why does that make file extensions irrelevant for execution?

A Windows user asks where the .exe files live on a Linux box. What is the accurate answer, including the one real exception?

You just compiled a binary in your current directory and typing its name gives "command not found". Why, and what is the fix?

From a desktop terminal, what does xdg-open do that plain execution does not, and what is its portable-looking alias on some distros?

In a terminal, what is the difference between a foreground and a background job, and how do you move an already-running foreground command into the background without killing it?

Plain ps in a terminal shows only a handful of processes on a busy graphical system. Why, and what invocation lists everything?

Start learning today

Free to start — download the app or use it in your browser.