unix - first OS like linux

linux  - OS Type

Distributions
	Impementations of linux and a set of tools(programs).

Most distributions are free
Stable
Very secure
Open-Source

1969 Ken Thompson, Dennis Ritchie
Bell Labs

GNU - a set of open source tools for the linux environment
	GNU Not Unix

Bourne Again SHell (bash)

Shell - command line tool/program to give OS commands

Terminal Emulator - program that looks like a terminal.  Give remote access to another computer.

PUTTY - the Teminal Emulator we will use

taz -name of hu cs dept. linux server
taz.harding.edu