Ways to use sed command
View selected lines of a document/file # sed -n ‘9,20p’ file.txt View the entire file except selected lines # sed ‘21,40d’ file.txt Replacing words or characters in a file #…
How to install/enable iptables on CentOS 7
On CentOS 7, FirewallD a default firewall management tool is enabled. In order to install iptables, we need FirewallD from server: # systemctl stop firewalld # systemctl disable firewalld #…
How to install FFmpeg on CentOS 7
FFmpeg is a free and open-source project consisting of a vast software suite of libraries and programs for handling video, audio, and other multimedia files and streams. It contains libavcodec,…
How To Add Swap Space on CentOS 7
Swap is a space on a disk that is used when the amount of physical RAM memory is full. When a Linux system runs out of RAM, inactive pages are…
How to Clone a Partition or Hard drive in Linux
There are several ways to clone Linux Partition using some external tools like partimage or Clonezilla. In this exercise we are going to survey Linux partition cloning with a command…
cPanel EasyApache 4 Installing Redis and Redis PHP extension
cPanel EasyApache 4 Installing Redis and Redis PHP extension Installing the Redis daemon: for CentOS 6/RHEL 6 for CentOS 7/RHEL 7 Installing the Redis PHP extension for all available versions…
Resetting email account password from Command line in cPanel
Resetting email account password from Command line in cPanel 1) Login to the server as root via SSH 2) Run the command “openssl” and you will see this: test@test #…
How to upgrade ubuntu 16.04 to ubuntu 18.04 ?
Check Ubuntu version before upgrading. lsb_release -a First, we have to run an update sudo apt update Then run upgrade command sudo apt upgrade After that dist-upgrade sudo apt dist-upgrade…
Postfix Spam Tracking
Get the mailids of all email currently in queue: postqueue -p|egrep “{11}”|awk ‘{print $1}’ Get the count of emails in queue: mailq | tail -n 1 or postqueue -p|egrep “{11}”|awk…