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Zimbra Enable PTR/Reverse DNS lookup Incomming Email

Zimbra Enable PTR/Reverse DNS lookup Incomming Email
A reverse DNS lookup or reverse DNS resolution (rDNS) is the querying of the Domain Name System (DNS) to determine the domain name associate...

How to using NGINX Multiple ssl certificates on one ip

How to using NGINX Multiple ssl certificates on one ip
I experienced setup and configure nginx multiple domain on one VPS. In this tutorial, How to using NGINX Multiple ssl certificates on one i...

Run bash script on boot time on centos

Run bash script on boot time on centos
How to Auto Execute Commands/Scripts During Reboot or Startup on centos . Many method to execute a command or run scripts during startup. ...

Linux create user

Linux create user
In this tutorial, I will guide use useradd create user in linux. The memo complete linux create user and how to user run sudo command with n...

Shell script parse xml in linux

Shell script parse xml in linux
How to use shell script parse xml file . In this tutorial, I will use grep command, awk command and sed command Reading xml file extracting ...

rename command in linux

rename command in linux
rename command similar with mv command. This command is slightly more advanced than mv  command. How to rename multiple files in linux. T...

How to setup OpenVPN Server on Centos 7

How to setup OpenVPN Server on Centos 7
In this tutorial, I will setup OpenVPN Server on Centos 7.   Step 1: Prepare install OpenVPN server sudo yum update -y sudo yum insta...

Failed to create the VirtualBox COM object solve problem

Failed to create the VirtualBox COM object solve problem
Someday, your Virtualbox not start and the display error "Failed to create the VirtualBox COM object". it got somewhat corrupted...

How to connect openvpn server from a linux computer

How to connect openvpn server from a linux computer
Connect access server (VPS) from a linux computer. In this tutorial, I will access server VPS installed OpenVPN server from a linux compute...

Split a string in shell and get the last field

Split a string in shell and get the last field
How to split a string in shell and get the last field. in this tutorial, i written a small program use bash script split string /www/huu/pha...