[ZanGetsu]

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Chapter 1: Shell Something Out 7 Introduction 8 Printing in the terminal 10 Playing with variables and environment variables 13 Function to prepend to environment variables 17 Math with the shell 19 Playing with file descriptors and redirection 21 Arrays and associative arrays 27 Visiting aliases 29 Grabbing information about the terminal 31 Getting and setting dates and delays 32 Debugging the script 36 Functions and arguments 37 Reading the output of a sequence of commands 40 Reading n characters without pressing the return key 43 Running a command until it succeeds 44 Field separators and iterators 45 Comparisons and tests 48 Chapter 2: Have a Good Command 53 Introduction 53 Concatenating with cat 54 Recording and playing back of terminal sessions 57 Finding files and file listing 58 Playing with xargs 68 Translating with tr 73 Checksum and verification 77 Cryptographic tools and hashes 80 ii Table of Contents Sorting unique and duplicates 83 Temporary file naming and random numbers 89 Splitting files and data 90 Slicing filenames based on extension 92 Renaming and moving files in bulk 95 Spell checking and dictionary manipulation 97 Automating interactive input 99 Making commands quicker by running parallel processes 102 Chapter 3: File In, File Out 105 Introduction 106 Generating files of any size 106 The intersection and set difference (A-B) on text files 107 Finding and deleting duplicate files 110 Working with file permissions, ownership, and the sticky bit 113 Making files immutable 118 Generating blank files in bulk 119 Finding symbolic links and their targets 120 Enumerating file type statistics 121 Using loopback files 124 Creating ISO files and hybrid ISO 127 Finding the difference between files, patching 130 Using head and tail for printing the last or first 10 lines 132 Listing only directories �?? alternative methods 135 Fast command-line navigation using pushd and popd 136 Counting the number of lines, words, and characters in a file 138 Printing the directory tree 139 Chapter 4: Texting and Driving 143 Introduction 143 Using regular expressions 144 Searching and mining a text inside a file with grep 147 Cutting a file column-wise with cut 154 Using sed to perform text replacement 158 Using awk for advanced text processing 162 Finding the frequency of words used in a given file 168 Compressing or decompressing JavaScript 170 Merging multiple files as columns 173 Printing the nth word or column in a file or line 174 Printing text between line numbers or patterns 175 Printing lines in the reverse order 176 Parsing e-mail addresses and URLs from a text 177 iii Table of Contents Removing a sentence in a file containing a word 178 Replacing a pattern with text in all the files in a directory 180 Text slicing and parameter operations 181 Chapter 5: Tangled Web? Not At All! 183 Introduction 184 Downloading from a web page 184 Downloading a web page as plain text 187 A primer on cURL 188 Accessing Gmail e-mails from the command line 192 Parsing data from a website 194 Image crawler and downloader 195 Web photo album generator 198 Twitter command-line client 201 Creating a "define" utility by using the Web backend 206 Finding broken links in a website 209 Tracking changes to a website 211 Posting to a web page and reading the response 214 Chapter 6: The Backup Plan 217 Introduction 217 Archiving with tar 218 Archiving with cpio 224 Compressing data with gzip 226 Archiving and compressing with zip 230 Faster archiving with pbzip2 231 Creating filesystems with compression 232 Backup snapshots with rsync 234 Version control based backup with Git 237 Creating entire disk images with fsarchiver 240 Chapter 7: The Old-boy Network 243 Introduction 243 Setting up the network 244 Let us ping! 250 Listing all the machines alive on a network 254 Running commands on a remote host with SSH 257 Transferring files through the network 261 Connecting to a wireless network 265 Password-less auto-login with SSH 267 Port forwarding using SSH 269 Mounting a remote drive at a local mount point 270 Network traffic and port analysis 271 iv Table of Contents Creating arbitrary sockets 274 Sharing an Internet connection 275 Basic firewall using iptables 276 Chapter 8: Put on the Monitor's Cap 279 Introduction 279 Monitoring disk usage 280 Calculating the execution time for a command 285 Collecting information about logged in users, boot logs, and boot failures 288 Listing the top 10 CPU consuming processes in an hour 291 Monitoring command outputs with watch 293 Logging access to files and directories 294 Logfile management with logrotate 296 Logging with syslog 297 Monitoring user logins to find intruders 299 Remote disk usage health monitor 303 Finding out active user hours on a system 305 Measuring and optimizing power usage 308 Monitoring disk activity 309 Checking disks and filesystems for errors 310 Chapter 9: Administration Calls 313 Introduction 313 Gathering information about processes 314 Killing processes and send or respond to signals 324 Sending messages to user terminals 327 Gathering system information 329 Using /proc for gathering information 330 Scheduling with cron 331 Writing and reading the MySQL database from Bash 335 User administration script 340 Bulk image resizing and format conversion 344 Taking screenshots from the terminal 347 Managing multiple terminals from one 348 Index 351

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