There are some scenarios where UNIX or Linux admin wants to run linux commands and insert the output of commands in vi editor without leaving it. This can be possible using below steps : First Go to command mode in vi editor by pressing ‘esc‘ … Read more
xargs is a command in UNIX like System that reads items from the standard input, delimited by blanks (which can be protected with double or single quotes or a backslash) or newlines, and executes the command (default is /bin/echo) one or more times with any … Read more
Q:1 What is Virtualization ? Ans: Virtualization is a technique for creating virtual resources (rather than the actual) such as server, storage device, network and Operating system. Virtualization is dis-associating the tight bond between software and hardware. Q:2 What are the different types of Virtualization … Read more
OpenSUSE is the most widely used linux distribution. It is free / opensource which is suitable for laptops, desktops, netbooks, servers and multimedia center PCs at home or in small offices. In this article we will discuss the installation steps of OpenSUSE 13.1 along with … Read more
MPlayer(Media Player) is a multimedia software in Linux like operating systems, it is used to play audio and video files from its GUI (SMPlayer) and command line. It supports a wide variety of video file formats, audio and video codecs, and subtitle types. Special input … Read more
After the release of Red Hat Enterprise Linux 7 (RHEL 7) , CentOS community has released its latest Operating System named as CentOS 7. Some of the new features in CentOS 7 as compared with CentOS 6.X are listed below : CentOS 7 uses XFS … Read more
Q:1 What is postfix and default port used for postfix ? Ans: Postfix is a open source MTA (Mail Transfer agent) which is used to route & deliver emails. Postfix is the alternate of widely used Sendmail MTA. Default port for postfix is 25. Q:2 … Read more
In Linux, It’s a security concern for organization to allow anyone to reboot the server using Ctrl-Alt-Del keys. It is always recommended in production boxes that one should disable reboot using Ctrl-Alt-Del keys. In this article we will discuss how can we disable reboot via … Read more
By default postfix only capture ‘From’ and ‘To’ details in the log file (/var/log/maillog). There are some scenarios where we want that email’s subject should be capture in the maillog. In this article we will discuss how to achieve this : We are assusming that … Read more
Badblocks is the command-line utility in Linux like operating systems which can scan or test the hard disk and external drive for bad sectors. Bad sectors or bad blocks is the space of the disk which can’t be used due to the permanent damage or … Read more
Awk is a scripting language which is used for processing or analyzing text files. Or we can say that awk command is mainly used for grouping of data based on either a column or field , or on a set of columns. Mainly it’s used … Read more
In this post, we will discuss how to use variables in bash shell scripting with examples. In every programming language variables plays an important role , in Linux shell scripting we can use two types of variables : System Defined Variables & User Defined Variables. … Read more
