If you’re working in command line mode, you may want to become familiar with at least one text editor that operates in the Linux console. The vi editor is the original editor used on Unix systems. It uses the console graphics mode to emulate a text-editing window, allowing you to see the lines of your […]
Archives for September 2021
Adobe Photoshop Interview Questions and Answers
What is Photoshop? Adobe Photoshop is a professional image editing software package that can be used by experts and novices alike. While this handout offers some very basic tips on using the tools available in Photoshop, more comprehensive guidance can be accessed on the web or in the help menu of your version of Photoshop. […]
Ajax Interview Questions and Answers
What’s AJAX? AJAX (Asynchronous JavaScript and XML) is a newly coined term for two powerful browser features that have been around for years, but were overlooked by many web developers until recently when applications such as Gmail, Google Suggest, and Google Maps hit the streets. Asynchronous JavaScript and XML, or Ajax (pronounced “Aye-Jacks”), is a […]
GlusterFS – Real Time Data Replication Across Multiple RHEL/CentOS Nodes
What is GlusterFS? GlusterFS is an open-source network/cluster filesystem and is based on a stackable user-space design. In this tutorial, we will achieve high availability of storage(i.e real-time replication of files) across two Linux machines using GlusterFS. Although glusterfs found its application in different areas like cloud computing, streaming media services, and content delivery networks. […]
Cisco SAN Switch Backup To Remote Machine
Question: We have configured the SAN switches(MultiLayer 9148) including zoning. Now For the Safer side, we need to take backup of these switches. How this can be achieved? Follow the Below Steps to configure Backup. Step 1: Login To your SAN Switch, Click on VSAN under the Datacenter, then Right click on VSAN name, then […]
RCRON – Setup High Availability of cron Jobs
rcron is a powerful tool that helps system administrators in setting up cron jobs redundancy and failover over groups of machines. RCRON ensures that a job installed on several machines will only run on the active one at any time. Working of RCRON High Availability using RCRON (One Node will be stamped as Active and […]
Mutt, Mail and Telnet – Send mails from linux command line or terminal
Mutt Mutt is a small but powerful text-based e-mail client for Unix-like operating systems. With the mutt command, one can send and read emails. Mutt supports both maildir & mbox mail formats. Mutt is compatible with POP & IMAP protocols. Syntax # mutt -s “Subject of the Mail” recipient-address@domain.com < /dev/null Example 1: Send a […]
Linux: No space left on device while df command shows a lot of free space
While working on Linux boxes system admin usually get this error “No Space left on device” While df commands show a lot of free space on the same partition or device. In my scenario I have an Apache-based application running on CentOS, I also face the same problem. Follow the below steps to solve this […]
sshpass Command: Non-interactive Password Authentication with SSH
Overview Linux system Admins normally login to the Linux servers either supplying a password or using key-based authentication. sshpass is a tool that allows us to automatically supply passwords to the command prompt so that automated scripts can be run as desired by users. sshpass supplies password to ssh prompt using dedicated tty, fooling ssh […]
Echo Command with Practical Examples
The echo command is a built-in shell command, which is used to display the value of a variable or print a line of text. Echo command plays an important role in building a shell script. Synatx # echo [Options] [String] The items in square brackets are optional. A string can be defined as a finite […]