Linux

Free operating system for various platforms that can be built and configured by the user or users to best suit their system needs. Chart includes detailed information on: - logging in & out - user & group manipulation - LINUX shells & command line - the file system - I/O redirection - wildcards & the VI editor - permissions & ownership - shell & user variables - FTP (File Transfer Protocol) - archiving files & directories - login shell scripts - job control & processes - command summary