Bash-Beginners-Guide

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Bash Guide for Beginners Table of Contents Index X...........................................................................................................................................................165 Y...........................................................................................................................................................165 Z...........................................................................................................................................................165 vii
Introduction 1. Why this guide? The primary reason for writing this document is that a lot of readers feel the existing HOWTO to be too short and incomplete, while the Bash Scripting guide is too much of a reference work. There is nothing in between these two extremes. I also wrote this guide on the general principal that not enough free basic courses are available, though they should be. This is a practical guide which, while not always being too serious, tries to give real-life instead of theoretical examples. I partly wrote it because I don't get excited with stripped down and over-simplified examples written by people who know what they are talking about, showing some really cool Bash feature so much out of its context that you cannot ever use it in practical circumstances. You can read that sort of stuff after finishing this book, which contains exercises and examples that will help you survive in the real world. From my experience as UNIX/Linux user, system administrator and trainer, I know that people can have years of daily interaction with their systems, without having the slightest knowledge of task automation. Thus they often think that UNIX is not userfriendly, and even worse, they get the impression that it is slow and old-fashioned. This problem is another one that can be remedied by this guide. 2. Who should read this book? Everybody working on a UNIX or UNIX-like system who wants to make life easier on themselves, power users and sysadmins alike, can benefit from reading this book. Readers who already have a grasp of working the system using the command line will learn the ins and outs of shell scripting that ease execution of daily tasks. System administration relies a great deal on shell scripting; common tasks are often automated using simple scripts. This document is full of examples that will encourage you to write your own and that will inspire you to improve on existing scripts. Prerequisites/not in this course: • You should be an experienced UNIX or Linux user, familiar with basic commands, man pages and documentation • Being able to use a text editor • Understand system boot and shutdown processes, init and initscripts • Create users and groups, set passwords • Permissions, special modes • Understand naming conventions for devices, partitioning, mounting/unmounting file systems • Adding/removing software on your system See Introduction to Linux (or your local TLDP mirror) if you haven't mastered one or more of these topics. Additional information can be found in your system documentation (man and info pages), or at the Linux Documentation Project. Introduction 1
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Page 23 and 24: • Brace expansion • Tilde expan
Page 25 and 26: A number of methods can be used; on
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Page 29 and 30: Chapter 2. Writing and debugging sc
Page 31 and 32: the documentation of your favorite
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Page 35 and 36: Bash Guide for Beginners + set +x I
Page 37 and 38: Chapter 3. The Bash environment In
Page 39 and 40: Bash Guide for Beginners local pid
Page 41 and 42: MOZILLA_FIVE_HOME=/usr/lib/mozilla
Page 43 and 44: Bash Guide for Beginners franky ~>
Page 45 and 46: the GNU Awk programming language is
Page 47 and 48: Bash Guide for Beginners 3.2.4. Res
Page 49 and 50: LINES MACHTYPE MAILCHECK OLDPWD OPT
Page 51 and 52: two is the second positional parame
Page 53 and 54: Bash Guide for Beginners 3.3.1. Why
Page 55 and 56: A correctly-formed brace expansion
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of the whitespace characters "space
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Bash Guide for Beginners /dev/hda5
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Bash Guide for Beginners 3.7. Summa
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Two regular expressions may be conc
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LABEL=/ / ext3 defaults 1 1 If this
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cathy ~> ls -ld [[:digit:]]* drwxrw
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Bash Guide for Beginners p Print te
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sandy ~> sed -n '/a text/,/This/p'
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Bash Guide for Beginners # This is
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Chapter 6. The GNU awk programming
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Bash Guide for Beginners 121script.
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Bash Guide for Beginners amd.conf a
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Bash Guide for Beginners record1 re
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Bash Guide for Beginners 6.3.6. The
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Chapter 7. Conditional statements I
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Bash Guide for Beginners Table 7-2.
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Bash Guide for Beginners 7.1.2.2. N
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[root@elegance root]# We switch to
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Bash Guide for Beginners echo "Prop
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Bash Guide for Beginners We use the
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Bash Guide for Beginners case EXPRE
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Upon successful condition testing,
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Bash Guide for Beginners bit better
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8.2. Catching user input 8.2.1. Usi
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Bash Guide for Beginners michel ~/t
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Bash Guide for Beginners # DO NOT E
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File descriptor 5 Bash Guide for Be
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Bash Guide for Beginners The result
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Bash Guide for Beginners ♦ Compre
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Bash Guide for Beginners for i in `
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touch pic-`date +%s`.jpg sleep 300
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DISKFUL=$(df -h $WEBDIR | grep -v F
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;; 2) $FORTUNE startrek ;; 3) $FORT
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[carol@octarine ~/test] ls -a ./ ..
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Bash Guide for Beginners 9.7.2. Exa
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Chapter 10. More on variables In th
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Bash Guide for Beginners [bob in ~]
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if [ -z $1 ]; then echo "Usage: $0
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10.3.3. Transformations of variable
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Bash Guide for Beginners The opposi
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Chapter 11. Functions In this chapt
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The commands after && are only exec
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zip2 "$TAR" echo "...done." >> "$LO
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Chapter 12. Catching signals In thi
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Bash Guide for Beginners maud: ~> k
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Bash Guide for Beginners 2. Write a
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Bash Guide for Beginners jobs kill
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if [ $i -eq 5 ] ArrowUp+Enter or !!
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cd Change directory. cdp/cdplay An
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Bash Guide for Beginners gimp grep
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Send and receive mail. man Read man
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Bash Guide for Beginners rsh RPM Pa
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W Bash Guide for Beginners w Show w
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Index A aliases Section 3.5.1 ANSI-
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Bash Guide for Beginners Section 3.
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J Bash Guide for Beginners K kill k
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eadonly Section 10.1.3 regular expr
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Bash Guide for Beginners vi(m) Sect
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