This document discusses Linux basics and provides information on: 1) Linux is used in 89.2% of the world's top 500 supercomputers, with Cray, IBM, and SGI being major vendors. The top supercomputer, Jaguar, uses Linux and 224k Opteron processors. 2) Many large organizations like Google, CERN, Facebook, Twitter, YouTube, and Flickr rely on Linux for its high performance and scalability. Google handles 1 billion search requests daily on over 1 million Linux servers. 3) The document covers Linux installation, including hardware compatibility, disk space requirements, installation methods, partitioning, and the Filesystem Hierarchy Standard. It also discusses basic Linux configuration and