linux operating systems HowTo - Linux / Unix Q & A from nixCraft

How to check and list installed packages in CentOS Linux

last updated November 29, 2019 in CentOS, Linux, Package Management

How do I check installed packages in CentOS Linux version 6.x/7.x/8.x? How can I List installed packages on CentOS Enterprise Linux server?

Stress Test CPU and Memory (VM) On a Linux / Unix With Stress-ng

last updated July 18, 2018 in FreeBSD, Hardware, Linux, OpenBSD, UNIX

I want test my Linux, OpenBSD, FreeBSD and Unix-like server entirely for high load and monitoring the health under stress. How can I stress out my CPU, memory, I/O, and disk stress and more with stress test tool on a Linux or Unix-like systems?

Linux View Process Address Space

last updated November 4, 2012 in Linux

How do I view process address space under Linux operating systems?

HowTo: Revoke OpenSSH Keys and Disable User Access

last updated November 6, 2012 in UNIX

Many users are using ssh to log into a remote machine and append the indicated identity file to machine’s ~/.ssh/authorized_keys file. I recently moved one of my server, and I would like to revoke openssh keys and disable user access under Linux operating systems. How do I revoke OpenSSH keys under Unix or Linux operating systems?

HowTo: Linux Show List Of Network Cards

last updated September 4, 2012 in Hardware, Linux

How do I display a list of all network cards under Linux operating systems?

Install and Use nmon Tool To Monitor Linux Systems Performance

last updated October 3, 2012 in Linux

How do I install nmon command under Linux operating systems to find out performance information for my CPU, memory, network, disk, virtual memory, top process and other part of my HP server running on Debian Linux or CentOS Linux 6.x amd64 bit server?

Linux Find Out Name Of DVD / CD-ROM / Blu-ray Writer Device

last updated December 3, 2019 in Commands, Hardware, Linux

How do I find out what the name of my CD-ROM or DVD device or Blu-ray device is under Linux operating system without using GUI options?