Intro to UNIX Presented by: Student Ambassadors: Lauren Lewis Martin Sung

Introduction

Why Study Information Technology? Technology is advancing Businesses need faster and more efficient ways to transmit data IT gives people the ability to connect anywhere, at any time Paper products, such as magazines and newspapers, are becoming obsolete Careers: Web developer/designer Game developer/designer Systems analyst Network administrator Database administrator Information security Network security Mobile application development Software developer IT project manager

What is UNIX? UNIX is a family of multitasking, multiuser computer operating systems Dennis Ritchie and Ken Thompson of Bell Laboratories developed the UNIX operating system in the early 1970’s

Basic Computer System Components

Directories, Files, & Pathways Files A well defined repository of information Special files called directories contain or point to other files Structure of Directories Hierarchically structured like an inverted tree / is the starting directory or “root” Pathnames Locating a file by following a sequence of directories until you reach the file / is also the separator between the directories and final file

Example Directory binhomework docs juniormusicmovies Tay Swift calculus spanishHarry Potter hw / Absolute pathnames start at the root Example: /home/junior/calculus/hw Relative pathnames start at the current directory Example: If starting from file “junior" calculus/hw

Useful File Commands ls list files cat view file contents more view file contents (pause each screen)‏ touch creates file / updates time stamp cp copy file to a new file mv move file to a new directory, rename file rm delete file pwd display absolute pathname to current directory mkdir create directory rmdir remove directory cd navigate directories

Scripting In addition to typing commands directly to the shell, you can place them in a file and then run the file A file containing UNIX shell commands is known as a script (or shell script) Typical operations performed by shell scripts include file manipulation, program execution, and printing text

Script Example

Basic Script Commands #!/bin/sh: tells the parent shell which interpreter should be used to execute the script echo: writes its arguments to standard output read: reads a single line from standard input $: denotes a variable

So Why is UNIX Still Important Today? Open source software It’s EVERYWHERE! The Internet The telephone The UNIX way ▫Write programs that:  Do one thing and do it well  Work together  Handle text streams because that is the universal interface

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