Certified Linux Shell Scripting Professional

TABLE OF CONTENTS

• Printing the Terminal
• Playing with Variables and Environment Variables
• Function to Prepend to Environment Variables
• Math with the Shell
• Playing with File Description and Redirection
• Arrays and Associative Arrays
• Visiting Aliases
• Grabbing Information about the Terminal
• Getting and Setting Dates and Delays
• Debugging the Script
• Functions and Arguments
• Reading the Output of a Sequence of Commands
• Reading n Characters without Pressing the Return Key
• Running a Command Until It Succeeds
• Field Separators and Iterators
• Comparisons and Tests

• Concatenating with cat
• Recording and playingback of terminal sessions
• Finding files and file listing
• Playing with xargs
• Translating with tr
• Checksum and Verification
• Cryptographic Tools and Hashes
• Sorting Unique and Duplicates
• Temporary File Naming and Random Numbers
• Splitting Files and Data
• Slicing Filenames Based on Extension
• Renaming and Moving Files in Bulk
• Spell Checking and Dictionary Manipulation
• Automating Interactive Input
• Making Commands Quicker by Running Parallel Processes

• Generating files of any size
• The Intersection and Set Difference (A-B) on Text Files
• Finding and Deleting Duplicate Files
• Working with File Permissions, Ownership, and the Sticky Bit
• Making Files Immutable
• Generating Blank Files in Bulk
• Finding Symbolic Links and Their Targets
• Enumerating File Type Statistics
• Using Loopback Files
• Finding the Difference between Files, Patching
• Using Head and Tail for Printing the Last or First Ten Lines
• Listing Only Directories – Alternative Methods
• Fast Command-Line Navigation Using pushd and popd
• Counting the Number of Lines, Words and Characters in a File
• Printing the Directory Tree

• User regular expresions
• Searching and mining text inside a file with grep
• Cutting a File Column-Wise with Cut
• Using sed to Perform Text Replacement
• Using awk for Advanced Text Processing
• Finding Frequency of Words Used in a Given File
• Compressing or Decompressing JavaScript
• Merging Multiple Files as Columns
• Printing the nth Word or Column in a File or Line
• Printing Text between Line Numbers or Patterns
• Printing Lines in the Reverse Order
• Parsing E-mail Address and URLs from Text
• Removing a Sentence in a File Containing a Word
• Replacing a Pattern with Text in all Files in a Directory
• Text Slicing and Parameter Operations

5. Tangled Web? Not at All!!

• Downloading from a web page
• Downloading a Web Page as Plain Text
• A Primer on cURL
• Parsing Data from a Website
• Image crawler and downloader
• Web photo album generator
• Creating a "define" Utility by Using the Web Backend
• Finding Broken Links in a Website
• Tracking changes to a website
• Posting to a Web Page and Reading Response

• Archiving with tar
• Archiving with cpio
• Compressing data with gzip
• Archiving and Compressing with Zip
• Faster Archiving with pbzip2
• Creating filesystems with Compression
• Backup Snapshots with rsync
• Version Control-Based backup with Git
• Creating entire disk images using fsarchiver

• Let Us Ping!
• Listing All the Machines Alive on a Network
• Running Commands on a Remote Host with SSH
• Transferring Files through the Network
• Password-Less Auto-Login with SSH
• Port Forwarding and Mounting Remote Drives
• Network Traffic and Port Analysis
• Creating Arbitrary Sockets

• Monitoring Disk usage 
• Calculating the Execution Time for a Command
• Collecting Information about Logged-in Users, Boot Logs, and Boot Failures
• Listing the Top ten CPU Consuming Processes in an Hour
• Monitoring Command Outputs with Watch
• Logging Access to Files and Directories
• Logfile Management with logrotate
• Logging with syslogd
• Monitoring User Logins to Find Intruders
• Remote Disk Usage Health Monitor
• Finding Out Active User Hours on a System
• Measuring and Optimizing Power Usage
• Monitoring Disk Activity
• Checking Disks and Filesystems for Errors

• Gathering information about processes
• Killing Processes and Send or Respond to Signals
• Sending Messages to User Terminals
• Gathering System Information
• Using /proc for Gathering Information
• Scheduling with cron
• Writing and Reading the MySQL Database from Bash
• User Administration Script
• Bulk Image Resizing and Format Conversion
• Taking Screenshots from the Terminal
• Managing Multiple Terminals from One