Introduction to Linux Spring 2014, Section 02, Lecture 3 Jason Tang
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1 Introduction to Linux Spring 2014, Section 02, Lecture 3 Jason Tang
2 Topics What is an Operating System Overview of Linux Linux commands Shell Submit system
3 What is an Operating System? Special type of computer program Controls CPU, I/O, memory, and other devices Controls how other programs work together First program run when computer turns on Often referred to as simply OS
4 Consumer Operating Systems Microsoft: Windows Vista, Windows 7, Windows 8 Apple: Mac OS X 10.7, 10.8, Mavericks ios 5, 6, 7 Linux: 2.6, 3.10, 3.13 Android Ice Cream Sandwich, Jelly Bean, Kit Kat
5 What does an OS do? Provides a uniform user interface Abstracts hardware from user [Almost] same user interface regardless of iphone or ipad Handles user interactions Mouse click, keyboard press, touch, gesture, etc.
6 What else does an OS do? Presents a uniform interface to software Hardware abstraction layer (HAL) Program written for Windows 7 will [usually] run same on a Dell laptop versus a HP desktop Note: same hardware can run different OSs (though still only one at a time [mostly true]) Lab computer runs Windows or Linux
7 Linux command line Command line when logging in to Linux via Terminal/TeraTerm Pro/Putty User prompt is shown, something that looks like: Name of Linux server you are on; linux1, linux2, etc. are linux1[1]% _ Number in brackets is the number of command you are about to run
8 Files In Linux, everything is a file Programs, documents, MP3s, movies, and more Consists of a sequence of bytes Files that contain other files are directories (aka folders)
9 Linux Filenames In Linux, all files must have a filename Filenames can have spaces, hyphens, underscores, most other special symbols For this class, just use letters, numbers, underscores ( _ ), and/or dot (. ) characters Linux filenames are case sensitive
10 Directories Directories contain zero or more other files Ergo, directories may contain other subdirectories Directories organized hierarchical in tree Parent directory is holder of subdirectories Use Linux command ls (stands for list ) to display contents of your directory Files within same directory must have unique
11 Creating Files Use a text editor to create human-readable files For this class, use the nano program to create and modify files (Other text editors exist; talk to me if interested) Usage: nano filename This is a command line argument
12 Manipulating Files Use cp (stands for copy) to duplicate a file Use rm (stands for remove) to permanently delete a file Need help? Look up things via man (stands for manual) like so: man cp Most commands have a --help argument Arguments that begin with a dash are called flags
13 Shell Program in to which you are typing commands (ls, cp, exit, etc.) When you log in to Linux, it starts a shell for you Different shells exist Can be programmed to do complex tasks
14 Subdirectories Your home directory is your initial location after log in Current directory is where you are currently located Use command cd (stands for change directory) to enter a subdirectory Use command cd.. to go up a directory That s c, d, a space, then two dots in a row
15 Paths Use command pwd (stands for present working directory) to display name of your current directory Forward-slash symbol ( / ) separates components of a path Topmost directory, simply /, is root directory Each running program has a current working directory
16 Common Linux Shell Commands ls - list files cp - copy file rm - remove file man - look up something in the manual pwd - display present working directory cd - change directory exit - exits shell (and thus logs you off system)
17 Submit Command Use submit cs104_jtang assignment filename to submit filename for a given assignment Run submitls to view your submission Run submitrm to remove a file from your submission
18 Practice Using Submit Use nano to create a file named hw0.txt Enter your name, and then the two commands that will remove old files you no longer need Save, then exit Submit this file, then confirm your submission, like so: submit cs104_jtang hw0 hw0.txt submitls cs104_jtang hw0 You earned an extra credit point for today!
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