1. UNIX History - joint venture between MIT and Bell Labs (originally called Multics) –1969 - Ken Thompson (AT&T) created an operating system to run Space program –Ritchie (AT&T) wanted to run C program –multitasking, multi-user, timesharing

2. 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

3. 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

4. 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

5. 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 (email) are the links to the network and the outside world UNIX can work with various computers via VT100 terminal emulation

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