Linux has a few Domain Name System (DNS) server query tools that you can access via the command line. You can use these tools to test whether your domain name’s authoritative nameservers are responding correctly or not. Using them you can diagnose problems with DNS records.
command line utility
Changing Konsole colors in KDE using the shell
The K Desktop Environment (KDE) includes a great terminal program called Konsole. Using Konsole you can access the Linux command line from within KDE. With Konsole you can change the background and foreground colors of your terminal window, and one of the best features is the ability to set the colors using the command line or Linux shell. This allows you to do some cool things like change the color scheme depending on the program you are running.
Memory usage of a process under Linux
Finding out the memory usage of a process under Linux can be a bit confusing. That is because Linux doesn’t have one number for a process’ memory usage.
Finding out disk space usage using Linux shell
Finding out your disk space usage using the shell or command line in Linux is easy once you know how. This article takes a look at the different commands that tell you your disk space usage at different levels of the file system i.e. from entire disk volumes/partitions all the way down to individual files and directories.
CentOS Linux: Secure password-less SSH access
Secure Shell or SSH is used to access a remote Linux based Virtual Private Server (VPS) or dedicated server. Using SSH you can log into the remote server’s command line interface to carry out server administration tasks. SSH connections are encrypted so its safer than using alternate methods like telnet. But because SSH is so widely used it is often the target of malicious individuals looking to compromise your server. So it’s important to secure SSH access to your server.