Free operating system for various platforms that can be built and configured by the user or users to best suit their system needs. This 6-page laminated guide includes detailed information on: logging in and out, user and group manipulation, LINUX shells and command line, the file system, I/O redirection, wildcards and the VI editor, permissions and ownership, shell and user variables, FTP (File Transfer Protocol), archiving files and directories, login shell scripts, job control and processes, and command summary.