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Introduction

IT244 - Introduction to Linux / Unix Instructor: Bo Sheng

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General Information• Location and Time

– S-3-143, Mon & Wed, 4:00 ~ 5:15pm– Door code: 392467*

• Office Hours– Science Center, S-3-167, Mon & Wed, 2 ~ 4pm– TA office hours: TBD

• Course web page– http://www.cs.umb.edu/~shengbo/teaching/it244.html

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General Information• Grading Policy

– 10 homework/project assignments

– Mid-term and final exams

– Homework (60%) + Mid-term (15%) + Final (25%)

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General Information• Course Content

– Exclude Chapter 7, 9, 16, 17

– Linux/Unix commands and utilities– Shell (Bourne Shell)– File systems– Text editor (vim)– Scripting

• Shell scripting, awk, sed, perl– Introductory level coverage

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General Information• Course Content

– Command-line interface (CLI)– No graphic user interface (GUI)

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General Information• Course Content

– Hands-on practice (lab / home)– Lecturing style (slides + demo + practice)– Login to a dedicated server from any computer– Unix account and register for this course

• University’s Policies– Plagiarism, Honor code– Emergency– Disability service

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Unix Account• If you haven’t got an account

– http://www.cs.umb.edu/sp/resources/other/faqs/#FAQ02

• SSH (Secure Shell)– Use terminal (Linux/Mac OS clients)– Use other software tool (Windows client)

• PuTTY

http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html

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Unix Account• If you haven’t got an account

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Unix Account• If you haven’t register you account with this class

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Unix Account• If you haven’t register you account with this class

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Overview of Linux/Unix• Why we learn Linux/Unix?

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OS Platform Statistics (Web) http://www.w3schools.com/browsers/browsers_os.asp

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Web Server Surveyhttps://secure1.securityspace.com/s_survey/data/201511/index.htmlhttps://secure1.securityspace.com/s_survey/data/man.200907/apacheos.html

3.16% of Apache running on Windows servers

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Top 500 Supercomputers http://top500.org/statistics/list/

OPERATING SYSTEM FAMILY COUNT SYSTEM SHARE (%) RMAX (GFLOPS) RPEAK (GFLOPS) CORES

Linux 494 98.8 419,253,297 640,067,791 29,226,383Unix 6 1.2 1,868,442 2,215,095 76,128

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Overview of Linux/Unix• Why we learn Linux/Unix?

– Job prospects• Proficiency with Linux/Unix• Basic knowledge of scripting

– Basics for other courses

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Overview of Linux/Unix• Why we learn Linux/Unix?• What is Linux/Unix?

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Operating Systems

o Resource managemento Hardware abstractiono User interface

System calls

e.g., open(), read()

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History of Linux / Unix• Timeline http://www.levenez.com/unix/• Milestones

– 1969: Unix starts at Bell Labs– 1971: First edition of Unix– 1977: 1BSD from Berkeley– 1983: GNU project (GPL)– 1991: Linux is announced

Hello everybody out there using minix -I'm doing a (free) operating system (just a hobby, won't be big and professional like gnu) for 386(486) AT clones. …PS. Yes – it's free of any minix code, …

—Linus Torvalds

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Linux / Unix Operating Systems

http://www.kernel.org

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Some Current Distributions

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Overview of Linux/Unix• Why we learn Linux/Unix?• What is Linux/Unix?• Features of Linux/Unix

– FREE (no charge, open source)– Multiuser– Multitasking– Multiplatform (portable)

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Overview of Linux/Unix• Why we learn Linux/Unix?• What is Linux/Unix?• Features of Linux/Unix• Shell

– Command interpreter– ‘Programming language’ with no compilation– Bash, Tcsh, Dash, Zsh, …

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Overview of Linux/Unix• Why we learn Linux/Unix?• What is Linux/Unix?• Features of Linux/Unix• Shell• File System Structure

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Overview of Linux/Unix

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Login to Server• Server (hostname):

• it244a.cs.umb.edu• it244b.cs.umb.edu

• SSH (Secure Shell, no more telnet)– Use terminal (Linux/Mac OS clients)– Use other software tool (Windows client)

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Login to Server• Server (hostname):

• it244a.cs.umb.edu• it244b.cs.umb.edu

• SSH (Secure Shell)– Use terminal (Linux/Mac OS clients)– Use other software tool (Windows client)

• PuTTY

• Instructions on course web page

http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html

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Login to Server (Windows)• PuTTY

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Login to Server (Windows)• PuTTY

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Login to Server• SSH (Secure Shell)

– Use a terminal (Linux/Mac OS clients)– ssh username@hostname– ssh –l username hostname

e.g.,– ssh shengbo@it244a.cs.umb.edu– ssh –l shengbo it244a.cs.umb.edu

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Login to Server (Linux / Mac)• Terminal

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Login to Server (Linux / Mac)• Terminal