Cover -- Title Page -- Copyright and Credits -- Packt Upsell -- Contributors -- Table of Contents -- Preface -- Chapter 1: Crash Course in Bash -- Getting started with Bash and CLI fundamentals -- Your first Bash script with Vim -- Creating and using basic variables -- Hands-on variable assignment -- Hidden Bash variables and reserved words -- Conditional logic using if, else, and elseif -- Evaluating binary numbers -- Evaluating strings -- Nested if statements -- Case/switch statements and loop constructs -- Basic case statement -- Basic loops -- For loop -- Do while loop -- Until loop -- Using functions and parameters -- Using a function with parameters within a for loop -- Including source files -- Including/importing a library script and using external functions -- Retrieving return codes and output -- Return code 101 -- Linking commands, pipes, and input/output -- Redirection and pipe bonzanza -- Getting program input parameters -- Passing your program flags -- Getting additional information about commands -- Summary -- Chapter 2: Acting Like a Typewriter and File Explorer -- Introduction -- Basic searching for strings and files -- Getting ready -- How to do it... -- How it works... -- Using wildcards and regexes -- Getting ready -- How to do it... -- How it works... -- Math and calculations in script -- Getting ready -- How to do it... -- How it works... -- Striping/altering/sorting/deleting/searching strings with Bash only -- Getting ready -- How to do it... -- How it works... -- Using SED and AWK to remove/replace substrings -- Getting ready -- How to do it... -- How it works... -- Formatting your data/output using echo and printf -- Getting ready -- How to do it... -- How it works... -- Readying your script for different languages with internationalization -- Getting ready -- How to do it... -- How it works... -- Calculating statistics and reducing duplicates based on file contents -- Getting ready -- How to do it... -- How it works... -- Using file attributes with conditional logic -- Getting ready -- How to do it... -- How it works... -- Reading delimited data and altered output format -- Getting ready -- How to do it... -- How it works... -- Chapter 3: Understanding and Gaining File System Mastery -- Introduction -- Viewing files from various angles – head, tail, less, and more -- Getting ready -- How to do it... -- How it works... -- Searching for files by name and/or extension -- Getting ready -- How to do it... -- How it works... -- Creating a diff of two files and patching -- Getting ready -- How to do it... -- How it works... -- Creating symbolic links and using them effectively -- How to do it... -- How it works... -- Crawling filesystem directories and printing a tree -- Getting ready -- How to do it... -- How it works... -- Finding and deleting duplicate files or directories -- Getting ready -- How to do it... -- How it works... -- Joining and splitting files at arbitrary positions -- Getting ready -- How to do it... -- How i.
t works... -- Generating datasets and random files of various size -- Getting ready -- How to do it... -- How it works... -- Chapter 4: Making a Script Behave Like a Daemon -- Introduction -- Running a program continuously (forever) using looping constructs or recursion -- Getting ready -- How to do it... -- How it works... -- Keeping programs/scripts running after logoff -- Getting ready -- How to do it... -- How it works... -- Invoking commands when they require permissions -- Getting ready -- How to do it... -- How it works... -- Sanitizing user input and for repeatable results -- Getting ready -- How to do it... -- How it works... -- Making a simple multi-level user menu using select -- Getting ready -- How to do it... -- How it works... -- Generating and trapping signals for cleanup -- Getting ready -- How to do it... -- How it works... -- Using temporary files and lock files in your program -- Getting ready -- How to do it... -- How it works... -- Leveraging timeout when waiting for command completion -- Getting ready -- How to do it... -- How it works... -- Creating a file-in-file-out program and running processes in parallel -- Getting ready -- How to do it... -- How it works... -- Executing your script on startup -- Getting ready -- How to do it... -- How it works... -- Chapter 5: Scripts for System Administration Tasks -- Introduction -- Gathering and aggregating system information -- Getting ready -- How to do it... -- How it works... -- Gathering network information and connectivity diagnostics -- Getting ready -- How to do it... -- How it works... -- Configuring basic network connectivity -- Getting ready -- How to do it... -- How it works... -- Monitoring directories and files -- Getting ready -- How to do it... -- How it works... -- Compressing and archiving files -- Getting ready -- How to do it... -- How it works... -- Rotating files from RAM to storage for log rotation -- Getting ready -- How to do it... -- Adding configuration to /etc/logrotate.d/ -- How it works... -- Using Linux iptables for a firewall -- Getting ready -- How to do it... -- How it works... -- Accessing SQL databases remotely or locally -- Getting ready -- How to do it... -- How it works... -- Creating SSH keys for password less remote access -- Getting ready -- How to do it... -- Creating and configuring cron Jobs for task scheduling -- How to do it... -- How it works... -- Creating users and groups systematically -- How to do it... -- How it works... -- Chapter 6: Scripts for Power Users -- Introduction -- Creating Syslog entries and generating an alarm -- Getting ready -- How to do it... -- How it works... -- Backing up and erasing media, disks, and partitions with DD -- Getting ready -- How to do it... -- How it works... -- Creating graphics and presentations on the CLI -- Getting ready -- How to do it... -- How it works... -- Checking for file integrity and tampering -- Getting ready -- How to do it... -- How it works... -- Mounting network file systems.
and retrieving files -- Getting ready -- How to do it... -- How it works... -- Browsing the web from the CLI -- Getting ready -- How to do it... -- How it works... -- Capturing network traffic headlessly -- Getting ready -- How to do it... -- How it works... -- Finding binary dependencies -- Getting ready -- How to do it... -- How it works... -- Fetching time from different locations -- Getting ready -- How to do it... -- How it works... -- Encrypting/decrypting files from a script -- Getting ready -- How to do it... -- How it works... -- Chapter 7: Writing Bash to Win and Profit -- Introduction -- Creating a lame utility HTTP server -- Getting ready -- How to do it… -- How it works… -- Parsing RSS feeds and output HTML -- Getting ready -- How to do it… -- How it works… -- Scraping the web and collecting files -- Getting ready -- How to do it… -- How it works… -- Making a simple IRC chat bot logger -- Getting ready -- How to do it… -- How it works… -- Blocking IP addresses from failed SSH attempts -- Getting ready -- How to do it… -- How it works… -- Playing and managing audio from Bash -- Getting ready -- How to do it… -- How it works… -- Creating a simple NAT and DMZ firewall -- Getting ready -- How to do it… -- How it works… -- Parsing a GitHub project and generate a report -- Getting ready -- How to do it… -- How it works… -- Creating a poor man''s incremental remote backup -- Getting ready -- How to do it… -- How it works… -- Using Bash scripts to monitor udev input -- Getting ready -- How to do it… -- How it works… -- Using Bash to monitor battery life and optimize it -- Getting ready -- How to do it… -- How it works… -- Using chroot and restricted Bash shells to secure scripts -- Getting ready -- How to do it… -- How it works… -- Chapter 8: Advanced Scripting Techniques -- Introduction -- Calculating and reducing the runtime of a script -- Getting ready -- How to do it... -- How it works... -- Writing one-line conditional statements and loops -- Getting ready -- How to do it... -- How it works... -- Avoiding command not found warnings/errors and improving portability -- Getting ready -- How to do it... -- How it works... -- Creating a config file and using it in tandem with your scripts -- Getting ready -- How to do it... -- How it works... -- Improving your shell – GCC and command line colors -- Getting ready -- How to do it... -- How it works... -- Adding aliases, and altering user paths/variables -- Getting ready -- How to do it... -- How it works... -- Echoing output to raw terminal devices -- Getting ready -- How to do it... -- How it works... -- Creating simple frontend GUIs for Bash scripts -- Getting ready -- How to do it... -- How it works... -- Compiling and installing your own Bash shell -- Getting ready -- How to do it... -- How it works... -- Recording terminal sessions for automation -- Getting ready -- How to do it... -- How it works... -- Writing high-quality scripts by example -- Getting ready -- How to do it... -- How it .
