How to fix apt 404 Not Found error on Debian/Ubuntu
You may encounter a "404 Not Found" error when you want to install a package in a Debian-based host. The reason is quite obvious, the URLs for downloading the packages…
Regular Expressions in Linux
Regular Expression is a set of characters that defines a search pattern in a text. Regular Expression is used in UNIX text processing utilities like AWK, sed, grep, and more.…
How to use grep command in Linux/macOS
Global Regular Expression Print (grep) is a UNIX utility that searches text files or standard input for lines that match a string (Regular Expression) and prints the result to standard…
How to reset forgotten root password on CentOS 7 / CentOS 8
In this short step by step tutorial, you will learn how to reset a forgotten root password for CentOS / RHEL 7 and 8 nodes.