Herald mail
The later processes are given larger PID numbers.Ī process’s parent is the process that was responsible for spawning it. This process is then responsible for spawning every other process on the system. Running ps without any arguments provides very little information: For this, Linux provides another standard command called ps to query running processes. A dashboard interface can provide an overview, but usually does not return directly actionable output. Top and htop provide a dashboard interface to view running processes similar to a graphical task manager. In the next section, you’ll learn about how to use tools to query specific processes. You can also learn more about how to use top and htop. You can exit htop by pressing Ctrl+C as with top. Unlike top, It is not always installed by default, but can be considered a drop-in-replacement. Htop provides better visualization of multiple CPU threads, better awareness of color support in modern terminals, and more sorting options, among other features. On Ubuntu 20.04, you can install it with apt:Īfter that, the htop command will be available: This sends a kill signal, instructing the process to stop gracefully if it is able to.Īn improved version of top, called htop, is available in most package repositories. top will continue running in your shell until you stop it using the standard key combination of Ctrl+C to exit a running process. By default, top automatically sorts these by CPU usage, so you can see the busiest processes first. The remainder of the displayed output shows the running processes and their usage statistics. You can see that there is 1 running process, and 55 processes that are considered to be sleeping because they are not actively using CPU cycles. The first several lines of output provide system statistics, such as CPU/memory load and the total number of running tasks.
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