Linux is an open-source operating system (OS). An operating system is software that directly manages a system’s hardware and resources, like CPU, memory, and storage. The OS sits between applications and hardware and makes the connections between all of your software and the physical resources that do the work. Here, at https://blog.eduguru.in, We will discuss and solve real-life problems coming on Linux OS. We also know more interesting features of Linux here.
In this post we learn how to recognise, create, remove, copy and move files using commands like file, touch, rm, cp, mv and rename. all files are case sensitive Files on Linux (or any Unix) are case sensitive. This means that FILE1 is different from file1, and /etc/hosts is different from /etc/Hosts (the latter one … Read more
This module is a brief overview of the most common commands to work with directories: pwd, cd, ls, mkdir and rmdir. These commands are available on any Linux (or Unix) system. pwd The you are here sign can be displayed with the pwd command (Print Working Directory). Go ahead, try it: Open a command line … Read more
This post will explain the use of man pages (also called manual pages) on your Unix or Linux computer. You will learn the man command together with related commands like whereis, whatis and mandb. Most Unix files and commands have pretty good man pages to explain their use. Man pages also come in handy when … Read more
This post briefly explains the different licenses used for distributing operating systems software. about software licenses There are two predominant software paradigms: Free and Open Source Software (FOSS) and proprietary software. The criteria for differentiation between these two approaches is based on control over the software. With proprietary software, control tends to lie more with … Read more
This post gives a short overview of current Linux distributions. A Linux distribution is a collection of (usually open source) software on top of a Linux kernel. A distribution (or short, distro) can bundle server software, system management tools, documentation and many desktop applications in a central secure software repository. A distro aims to provide … Read more
This post briefly tells the history of Unix and where Linux fits in. 1969 All modern operating systems have their roots in 1969 when Dennis Ritchie and KenThompson developed the C language and the Unix operating system at AT&T Bell Labs.They shared their source code (yes, there was open source back in the Seventies) … Read more
Jonathan James Jonathan James was an American hacker. He is the first Juvenile who send to prison for cybercrime in the United States. He committed suicide on 18 May 2008, of a self-inflicted gunshot wound. In 1999, at the age of 16, he gained access to several computers by breaking the password of a NASA … Read more
Use of Colon in Shell script Sometimes it is useful to have a command which does “nothing”. The : (colon) command in Unix does nothing #!/bin/sh if grep unix myfile then : else echo “Sorry, unix was not found” fi
Use of Semicolons in Shell Script Instead of being on separate lines, statements can be separated by a semicolon (;) – For example: if grep “UNIX” myfile; then echo “Got it”; fi – This actually works anywhere in the shell. % cwd=`pwd`; cd $HOME; ls; cd $cwd
if Statement in Shell Script Simple form: if decision_command_1 then command_set_1 fi Example: if grep unix myfile >/dev/null then echo “It’s there” fi