Linux HowTo - Linux / Unix Q & A from nixCraft

Linux find Windows 10 OEM product key command

last updated January 17, 2020 in CentOS, Debian / Ubuntu, Linux, RedHat and Friends, Suse, Ubuntu Linux, Windows

I removed and installed Ubuntu Linux 16.04 LTS on my development Lenovo laptop. However, I need to use my Windows 10 pro in KVM VM for running the accounting app. How do I find and print my embedded Windows 10 pro key from a Linux command line option? How can I retrieve Microsoft Windows 8 and 10 OEM product key from BIOS?

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 January 15, 2020 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?