How to see the cgroup of a process

Learn how to find the control group (cgroup) of a process by using /proc, pidof, or ps.


The control group of a process can be retrieved from the /proc directory. We only need to know the PID of the process, which can be found using ps or pidof. Usage If we know that our PID is 1234, then showing the cgroup is as easy as using cat to see the contents of the ‘cgroup’ file. cat /proc/1234/cgroup To see the cgroup for the nginx process (or one of them), we could something like this.

How to see cgroup in ps output

Want to see the control group in the output of the ps command? Here is how to tune your command options to include that.


The ps command can show the control group of a process using the -o option, followed by the right column names. Usage To show processes and the control group, we can filter the output columns. # ps -e -o pid,cgroup:64,args PID CGROUP COMMAND 1 0::/init.scope /lib/systemd/systemd --system --deserialize 58 2 - [kthreadd] 3 - [rcu_gp] <snip> 576 - [xprtiod] 634 0::/system.slice/dbus.service @dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation --syslog-only 640 0::/system.slice/networkd-dispatcher.service /usr/bin/python3 /usr/bin/networkd-dispatcher --run-startup-triggers 645 - [nfsiod] 653 0::/system.

How to stop all processes of a single user

Learn how to stop all processes of a single user using the killall command.


Killing processes with a filter


The kill command can be used on Linux systems to send a defined signal to a process. Learn how to use it and what signals are available.


The kill command is used on Linux to send a process signals. This can be a numeric value or its defined name (e.g. SIGTERM).

What is a zombie process?

What is a zombie process on Linux and how to deal with it? In this article we will have a look at the details.



How to kill a zombie process

How to kill a zombie process if it does not respond to kill -9? Here are a few last steps that you can try.


Killing zombies, for fun?

How to show a running process name and its process ID (PID)

Find the process ID (PID) and process name on Linux with the help of the pgrep command.


Search for PID and process name

How to find all process IDs by its process name

Discover the process ID (PID) on Linux for a running process by searching for its process name.


Retrieve PIDs for a service

Linux process signals and their meaning

Want to know the difference between SIGHUP, SIGKILL, and SIGTERM? Learn about Linux process signals, including a list and description.


Linux uses signals to interact and define the state of a process. It uses POSIX reliable and real-time signals. The first are considered standard signals. Many programs are build using glibc and therefore use functions like kill(2) to send a signal to a process or processes group, or even all processes on the system. A process can decide to ignore a signal or take an action after it is received by a signal handler, a routine to catch incoming signals.

How to kill a running process by its name

Find and stop a running process on Linux by searching for its name using the killall or pkill command.


Stop a process by searching for its name

Processes: Frequently Asked Questions

Frequently asked questions about start and stop processes, discover information, and monitoring them.



This section provides tips and tricks to deal with processes on Linux systems. Got another tip? Let it know!


A Linux systems without processes is not possible. So we collect tips to deal with processes and improve your skills.

Kill a process that won't respond to CTRL+C

Got a process that won't respond to CTRL+C? With this tip you can kill almost all processes without having to open a second terminal.


Sometimes a process gets stuck and how often you try, it won’t respond to the combination of CTRL+C. One option is to open a second shell, then perform a kill. kill 1234 Pushing a job to the background While this works, there is usually a much easier way. This involves pushing a running process into the background by pressing CTRL+Z. [1]+ Stopped ./runserver Kill the process To get it back to the foreground, we would normally run fg.

Understanding what runs on your Linux system (and why)

Linux systems have a lot of processes running by default. Let's dive into how programs are started and how you can see all details of each running process.


Introduction Each Linux system has a bunch of processes running. Most of these processes might be familiar to you if you regularly use a command like ps or top to display them. Processes may look like just an item in a list. They are actually complicated pieces of code that are tamed by a memory manager. To truly understand how your system is running, knowledge of process (or memory) management is of great help.

Understanding memory information on Linux systems

Linux memory management is an extensive subject. This guide helps you understanding the how to analyze it and obtain available memory information.


Every operating system needs memory to store program code segments and data. This is also true for Linux systems. The problem: there is a lot of information available regarding memory usage and its behavior. Let’s discover how Linux manages its memory and how we can gather memory information. After reading this guide, you will be able to: Show the total amount of memory Display all memory details Understand the details listed in /proc/meminfo Use tools like dmesg, dmidecode, free, and vmstat Linux memory information Random access memory When we talk about memory in this article, we usually mean random access memory (RAM).

Auditing Linux processes: The Deep Dive!

In-depth article about auditing Linux processes. Determination of running processes, memory and on-disk structure and the proper tools for analyzing them.


From the initial start of the Linux operating system, the first processes are already born. In this article we have a look on dealing with processes. In particular we look at how to do process auditing. Whenever you are an auditor, system administrator or just a Linux enthusiast, you can’t ignore processes and should know how to deal with them. Process listing For most people working on Linux systems, it might be obvious to display running processes with ps.