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Linux Fundamentals Paul Cobbaut

Linux Fundamentals Paul Cobbaut Publication date 2015-05-24 CEST Abstract

This book is meant to be used in an instructor-led training. For self-study, the intent is to read this book next to a working Linux computer so you can immediately do every subject, practicing each command. This book is aimed at novice Linux system administrators (and might be interesting and useful for home users that want to know a bit more about their Linux system). However, this book is not meant as an introduction to Linux desktop applications like text editors, browsers, mail clients, multimedia or office applications. More information and free .pdf available at http://linux-training.be . Feel free to contact the author: • Paul Cobbaut: [email protected], http://www.linkedin.com/in/cobbaut Contributors to the Linux Training project are: • Serge van Ginderachter: [email protected], build scripts and infrastructure setup • Ywein Van den Brande: [email protected], license and legal sections • Hendrik De Vloed: [email protected], buildheader.pl script We'd also like to thank our reviewers: • Wouter Verhelst: [email protected], http://grep.be • Geert Goossens: geertgoossens

[email protected],

http://www.linkedin.com/in/

• Elie De Brauwer: [email protected], http://www.de-brauwer.be • Christophe Vandeplas: [email protected], http://christophe.vandeplas.com • Bert Desmet: [email protected], http://blog.bdesmet.be • Rich Yonts: [email protected], Copyright 2007-2015 Netsec BVBA, Paul Cobbaut Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled 'GNU Free Documentation License'.

Table of Contents I. introduction to Linux ................................................................................................................................... 1 1. Linux history .................................................................................................................................... 3 1.1. 1969 ....................................................................................................................................... 4 1.2. 1980s ...................................................................................................................................... 4 1.3. 1990s ...................................................................................................................................... 4 1.4. 2015 ....................................................................................................................................... 5 2. distributions ...................................................................................................................................... 6 2.1. Red Hat .................................................................................................................................. 7 2.2. Ubuntu ................................................................................................................................... 7 2.3. Debian .................................................................................................................................... 7 2.4. Other ...................................................................................................................................... 7 2.5. Which to choose ? ................................................................................................................. 8 3. licensing ............................................................................................................................................. 9 3.1. about software licenses ....................................................................................................... 10 3.2. public domain software and freeware ................................................................................. 10 3.3. Free Software or Open Source Software ............................................................................ 10 3.4. GNU General Public License .............................................................................................. 11 3.5. using GPLv3 software ......................................................................................................... 11 3.6. BSD license ......................................................................................................................... 12 3.7. other licenses ....................................................................................................................... 12 3.8. combination of software licenses ........................................................................................ 12 II. installing Linux ......................................................................................................................................... 13 4. installing Debian 8 ......................................................................................................................... 15 4.1. Debian .................................................................................................................................. 16 4.2. Downloading ........................................................................................................................ 16 4.3. virtualbox networking ......................................................................................................... 32 4.4. setting the hostname ............................................................................................................ 34 4.5. adding a static ip address .................................................................................................... 34 4.6. Debian package management .............................................................................................. 35 5. installing CentOS 7 ........................................................................................................................ 36 5.1. download a CentOS 7 image .............................................................................................. 37 5.2. Virtualbox ............................................................................................................................ 39 5.3. CentOS 7 installing ............................................................................................................. 44 5.4. CentOS 7 first logon ........................................................................................................... 52 5.5. Virtualbox network interface .............................................................................................. 53 5.6. configuring the network ...................................................................................................... 54 5.7. adding one static ip address ................................................................................................ 54 5.8. package management ........................................................................................................... 55 5.9. logon from Linux and MacOSX ......................................................................................... 56 5.10. logon from MS Windows ................................................................................................. 56 6. getting Linux at home ................................................................................................................... 58 6.1. download a Linux CD image .............................................................................................. 59 6.2. download Virtualbox ........................................................................................................... 59 6.3. create a virtual machine ...................................................................................................... 60 6.4. attach the CD image ............................................................................................................ 65 6.5. install Linux ......................................................................................................................... 68 III. first steps on the command line .............................................................................................................. 69 7. man pages ....................................................................................................................................... 71 7.1. man $command ................................................................................................................... 72 7.2. man $configfile .................................................................................................................... 72 7.3. man $daemon ...................................................................................................................... 72 7.4. man -k (apropos) ................................................................................................................. 72 7.5. whatis ................................................................................................................................... 72 7.6. whereis ................................................................................................................................. 72 7.7. man sections ........................................................................................................................ 73

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7.8. man $section $file ............................................................................................................... 73 7.9. man man .............................................................................................................................. 73 7.10. mandb ................................................................................................................................ 73 8. working with directories ............................................................................................................... 74 8.1. pwd ...................................................................................................................................... 75 8.2. cd .......................................................................................................................................... 75 8.3. absolute and relative paths .................................................................................................. 76 8.4. path completion ................................................................................................................... 77 8.5. ls ........................................................................................................................................... 77 8.6. mkdir .................................................................................................................................... 79 8.7. rmdir .................................................................................................................................... 79 8.8. practice: working with directories ....................................................................................... 81 8.9. solution: working with directories ...................................................................................... 82 9. working with files ........................................................................................................................... 84 9.1. all files are case sensitive ................................................................................................... 85 9.2. everything is a file .............................................................................................................. 85 9.3. file ........................................................................................................................................ 85 9.4. touch .................................................................................................................................... 86 9.5. rm ......................................................................................................................................... 87 9.6. cp .......................................................................................................................................... 88 9.7. mv ........................................................................................................................................ 89 9.8. rename .................................................................................................................................. 90 9.9. practice: working with files ................................................................................................ 91 9.10. solution: working with files .............................................................................................. 92 10. working with file contents ........................................................................................................... 94 10.1. head .................................................................................................................................... 95 10.2. tail ...................................................................................................................................... 95 10.3. cat ....................................................................................................................................... 96 10.4. tac ....................................................................................................................................... 97 10.5. more and less ..................................................................................................................... 98 10.6. strings ................................................................................................................................. 98 10.7. practice: file contents ........................................................................................................ 99 10.8. solution: file contents ...................................................................................................... 100 11. the Linux file tree ...................................................................................................................... 101 11.1. filesystem hierarchy standard .......................................................................................... 102 11.2. man hier ........................................................................................................................... 102 11.3. the root directory / ........................................................................................................... 102 11.4. binary directories ............................................................................................................. 103 11.5. configuration directories .................................................................................................. 105 11.6. data directories ................................................................................................................ 107 11.7. in memory directories ..................................................................................................... 109 11.8. /usr Unix System Resources ............................................................................................ 114 11.9. /var variable data ............................................................................................................. 116 11.10. practice: file system tree ............................................................................................... 118 11.11. solution: file system tree ............................................................................................... 120 IV. shell expansion ...................................................................................................................................... 122 12. commands and arguments ........................................................................................................ 125 12.1. arguments ......................................................................................................................... 126 12.2. white space removal ........................................................................................................ 126 12.3. single quotes .................................................................................................................... 127 12.4. double quotes ................................................................................................................... 127 12.5. echo and quotes ............................................................................................................... 127 12.6. commands ........................................................................................................................ 128 12.7. aliases ............................................................................................................................... 129 12.8. displaying shell expansion .............................................................................................. 130 12.9. practice: commands and arguments ................................................................................ 131 12.10. solution: commands and arguments .............................................................................. 133 13. control operators ........................................................................................................................ 135

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13.1. ; semicolon ....................................................................................................................... 136 13.2. & ampersand .................................................................................................................... 136 13.3. $? dollar question mark ................................................................................................... 136 13.4. && double ampersand .................................................................................................... 137 13.5. || double vertical bar ........................................................................................................ 137 13.6. combining && and || ....................................................................................................... 137 13.7. # pound sign .................................................................................................................... 138 13.8. \ escaping special characters ........................................................................................... 138 13.9. practice: control operators ............................................................................................... 139 13.10. solution: control operators ............................................................................................. 140 14. shell variables ............................................................................................................................. 141 14.1. $ dollar sign ..................................................................................................................... 142 14.2. case sensitive ................................................................................................................... 142 14.3. creating variables ............................................................................................................. 142 14.4. quotes ............................................................................................................................... 143 14.5. set ..................................................................................................................................... 143 14.6. unset ................................................................................................................................. 143 14.7. $PS1 ................................................