Introduction to Unix and the command line

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The operating system

All about the X

UNIX
Originally developed at AT&T Bell Labs circa 1970. Has experienced a contentious, fractured evolution
POSIX
think of this as a set of specifications of what an OS needs to qualify as "a Unix"

All about the X

The unix family tree

The unix family tree

OS X
is a Unix!
Linux
is not fully POSIX-compliant, but certainly can be regarded as functionally Unix

Some Unix hallmarks

The Command Line

GUI
Graphical user interface
CLI
Command-line interface

GUIs can be impressive