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

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

last updated November 17, 2018 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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HowTo: Use ps, kill, nice, and killall To Manage processes in FreeBSD and OS X Unix Operating System

last updated December 31, 2014 in Commands, FreeBSD, FreeBSD Jails (VPS), Mac OS X, OpenBSD, UNIX

I‘m a new Unix system user. How can I manage process on a FreeBSD operating systems?

CentOS / RHEL: Check If A Service Is Running Or Not

last updated December 13, 2013 in CentOS, Monitoring, RedHat and Friends

How do I find out if a service such as MySQL or Apache running on my Centos/RHEL/Fedora Linux server?

Linux / Unix: pwdx Command Examples

last updated February 1, 2014 in Commands, Linux, UNIX

I am new Linux and Unix system administrator. How do I find the current working directory of a process or server on Linux or Unix-like system using shell prompt?

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?

Gracefully Restart Nginx Web Server After Changes Made In a Config File

last updated December 6, 2012 in Linux, Nginx, UNIX

I know how to gracefully restart Apache web server under Unix like operating system. I made changes to nginx.conf. How do I gracefully restart Nginx web server? How do I make changes in a Nginx server config file to take effect without restarting the Nginx server itself without interrupting users’ current session?