pidof command HowTo - Linux / Unix Q & A from nixCraft

Bash check if process is running or not on Linux / Unix

last updated November 24, 2019 in BASH Shell, CentOS, Debian / Ubuntu, FreeBSD, Linux, UNIX

I am new to Linux shell scripting. I am using a CentOS 7 Linux and Ubuntu 18.04 LTS server in the cloud. How do I check if a process is running or not on Linux? How do I determine whether a process is running or not in a shell script running on an Ubuntu server?

Linux find process by name

last updated January 8, 2018 in CentOS, Debian / Ubuntu, Linux, RedHat and Friends, Suse

I am a new Linux user. How can I find a computer program/process by name on Linux? Is it possible to find a process by name instead of PID on a Linux?
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Linux how long a process has been running?

last updated May 10, 2020 in BASH Shell, CentOS, Debian / Ubuntu, Linux, RedHat and Friends, Suse

I‘m a new Linux system user and developer running Ubuntu server. How do I check how long a process or pid has been running on my Ubuntu or CentOS Linux server?

Linux Find Out What Process Are Using Swap Space

last updated November 28, 2018 in BASH Shell, Debian / Ubuntu, Linux, RedHat and Friends

The top and free command display the total amount of free and used physical and swap memory in the server. How do I determine which process is using swap space under Linux operating systems? How do I find out swap space usage of particular process such as memcached?

Linux: Find All File Descriptors Used By a Process

last updated July 1, 2011 in Linux

How can I find all the file descriptors used by a process such as httpd (Apache web server) or mysqld (MySQL Database server)?

Linux / UNIX: Find out or determine if process pid is running

last updated June 27, 2015 in CentOS, Debian / Ubuntu, FreeBSD, HP-UX Unix, Linux, RedHat and Friends, Solaris-Unix, UNIX

How do I find out my process is running on a Unix-like operating systems? How do I get the pid number for particular process on a Linux operating systems using bash shell?

Kill Process in Linux or Terminate a Process in UNIX / Linux Systems

last updated December 27, 2018 in Commands, Linux, UNIX

I am a new Linux system user. How do I kill a process on Linux based server using command line options? How can I kill running process on Unix?