UNIX History - joint venture between MIT and Bell Labs (originally called Multics) – Ken Thompson (AT&T) created an operating system to run Space program –Ritchie (AT&T) wanted to run C program –multitasking, multi-user, timesharing

Connection - remotely via a modem or locally over network - give IP address X Windows - gives it a GUI/graphics terminal Terminal definitions - customize keyboard terminal key (erase key, shorthand - alias) Command syntax - DOS-like Shells - commands and programs –% is C-Shell; $ is Korn, Bourne

Communication - ping, who, users, write, mail, broadcast messages Editors - VI is available on all systems; –EMACS Printing - lp; “dee-mon” (daemon) - a program in the background; for example: print spooling program

Redirection/pipes - can write errors to file Displaying files - more, pg, less, head, tail, permissions UNIX file system - regular files, directory, device files Directory is tree structured Process Control - can run jobs in the background with & at the end of the command; monitor; kill; make

Host is the server - shares resources Clients are the terminals –when you type, sent as signals to the host; the host echoes back to you Network, Gateways ( ) are the links to the network and the outside world UNIX can work with various computers via VT100 terminal emulation

UNIX: root directory bin boot dev ect home lib lost+found mnt net proc root sbin tmp usr var