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资源说明：Table of Contents
Preface 1
Chapter 1: Shell Something Out 7
Introduction 7
Printing in the terminal 9
Playing with variables and environment variables 12
Doing math calculations with the shell 17
Playing with file descriptors and redirection 19
Arrays and associative arrays 25
Visiting aliases 27
Grabbing information about terminal 29
Getting, setting dates, and delays 30
Debugging the script 33
Functions and arguments 35
Reading the output of a sequence of commands 38
Reading "n" characters without pressing Return 40
Field separators and iterators 41
Comparisons and tests 44
Chapter 2: Have a Good Command 49
Introduction 50
Concatenating with cat 50
Recording and playback of terminal sessions 53
Finding files and file listing 55
Playing with xargs 63
Translating with tr 69
Checksum and verification 72
Sorting, unique and duplicates 75
Temporary file naming and random numbers 80
Splitting files and data 81
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Slicing file names based on extension 84
Renaming and moving files in bulk 86
Spell checking and dictionary manipulation 89
Automating interactive input 90
Chapter 3: File In, File Out 95
Introduction 96
Generating files of any size 96
Intersection and set difference (A-B) on text files 97
Finding and deleting duplicate files 100
Making directories for a long path 103
File permissions, ownership, and sticky bit 104
Making files immutable 109
Generating blank files in bulk 110
Finding a symbolic link and its target 111
Enumerating file type statistics 113
Loopback files and mounting 115
Creating ISO files, Hybrid ISO 117
Finding difference between files, patching 120
head and tail – printing the last or first 10 lines 122
Listing only directories – alternative methods 125
Fast command-line navigation using pushd and popd 126
Counting number of lines, words, and characters in a file 128
Printing directory tree 129
Chapter 4: Texting and Driving 131
Introduction 132
Basic regular expression primer 132
Searching and mining "text" inside a file with grep 136
Column-wise cutting of a file with cut 142
Frequency of words used in a given file 146
Basic sed primer 147
Basic awk primer 150
Replacing strings from a text or file 156
Compressing or decompressing JavaScript 158
Iterating through lines, words, and characters in a file 161
Merging multiple files as columns 162
Printing the nth word or column in a file or line 163
Printing text between line numbers or patterns 164
Checking palindrome strings with a script 165
Printing lines in the reverse order 169
Parsing e-mail addresses and URLs from text 171
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Printing n lines before or after a pattern in a file 172
Removing a sentence in a file containing a word 174
Implementing head, tail, and tac with awk 175
Text slicing and parameter operations 177
Chapter 5: Tangled Web? Not At All! 179
Introduction 180
Downloading from a web page 180
Downloading a web page as formatted plain text 183
A primer on cURL 183
Accessing Gmail from the command line 188
Parsing data from a website 189
Image crawler and downloader 191
Web photo album generator 193
Twitter command-line client 195
define utility with Web backend 197
Finding broken links in a website 199
Tracking changes to a website 200
Posting to a web page and reading response 203
Chapter 6: The Backup Plan 205
Introduction 205
Archiving with tar 206
Archiving with cpio 211
Compressing with gunzip (gzip) 212
Compressing with bunzip (bzip) 215
Compressing with lzma 217
Archiving and compressing with zip 219
squashfs – the heavy compression filesystem 220
Cryptographic tools and hashes 222
Backup snapshots with rsync 224
Version control based backup with Git 227
Cloning hard drive and disks with dd 230
Chapter 7: The Old-boy Network 233
Introduction 233
Basic networking primer 234
Let's ping! 241
Listing all the machines alive on a network 243
Transferring files 247
Setting up an Ethernet and wireless LAN with script 250
Password-less auto-login with SSH 253
Running commands on remote host with SSH 255
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