Linux basics

Unix is an operating system developed by Bell Labs. Basically, it works on a command-line interface, and is designed for large systems. This operating system is not free, but it is proprietary and portable. Linux is a Unix clone developed by Linus Torvalds in 1991. It is open source, and you can use it in anything that has a processor. Linux is flexible, and you can modify and implement it as it is licensed under a GNU General Public License (GPL).