Linux 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?

How to use/run bash aliases over ssh based session

last updated December 26, 2017 in BASH Shell, Linux, OpenBSD, Troubleshooting, UNIX

I have set up a bash alias named file_repl. It works entirely when I log in using ssh command. However, my bash aliases are not running over ssh, for example:
$ ssh vivek@server1.cyberciti.biz file_repl bash: file_repl: command not found
How do I run bash shell aliases when I use ssh command?

How to find disk I/O latency with ioping monitoring tool on Linux

last updated September 21, 2017 in FreeBSD, Linux, Mac OS X, OpenBSD, UNIX

How do I monitor disk I/O latency in real time on Linux, FreeBSD, OpenBSD, and MacOS operating system?

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?

Connect To Amazon AWS EC2 Instance From a CentOS / RHEL Using SSH Client

last updated June 23, 2014 in Amazon Cloud Computing, CentOS, Linux, OpenBSD, RedHat and Friends, UNIX

I have created/launched Amazon Machine Image (AMI) instance powered by a CentOS/RHEL/Red Hat Enterprise Linux. How can I connect to my instance using OpenSSH Linux/Unix/OSX ssh client?

Linux: Jpeg Image Optimization / Compress Command

last updated September 23, 2013 in Amazon Cloud Computing, Linux, UNIX

I know how to optimize and compress png images using optipng command. line tool. I have lots of images in JPEG format. How do I compress and optimize JPEG images on my amazon cloud account so that I can save bandwidth on cloudfront cdn account? How do I use an image compressor to create lossless compression on JPEG files, with no effect on image quality in bulk using Linux?

gnome-terminal: There Was An Error Creating The Child Process For This Terminal

last updated December 4, 2012 in CentOS, RedHat and Friends, Troubleshooting

I am using CentOS 5 on my laptop. If I open gnome-terminal by right clicking the desktop, I am getting an error that read as follows:

There was an error creating the child process for this terminal

How do I fix this problem and open a terminal by right clicking the Debian / Ubuntu / CentOS / Fedora / RHEL / Red hat Enterprise Linux 5.x desktop system?