
Linux Shell Programming Pocket Primer
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Content
- Cover
- Title Page
- Copyright
- Dedication
- Contents
- Preface
- Chapter 1: Introduction
- Unix Versus Linux
- Available Shell Types
- What is bash?
- Getting Help for bash Commands
- Navigating Around Directories
- The history Command
- Listing Filenames with the ls Command
- Displaying the Contents of Files
- The cat Command
- The head and tail Commands
- The Pipe Symbol
- The fold Command
- File Ownership: Owner, Group, and World
- Hidden Files
- Handling Problematic Filenames
- Working with Environment Variables
- The env Command
- Useful Environment Variables
- Setting the PATH Environment Variable
- Specifying Aliases and Environment Variables
- Finding Executable Files
- The printf Command and the echo Command
- The cut Command
- The echo Command and Whitespaces
- Command Substitution (Backtick)
- The Pipe Symbol and Multiple Commands
- Using a Semicolon to Separate Commands
- The paste Command
- Inserting Blank Lines with the paste Command
- A Simple Use Case with the paste Command
- A Simple Use Case with cut and paste Commands
- Working with Metacharacters
- Working with Character Classes
- Working with "^" and "\" and "!"
- What about zsh?
- Switching between bash and zsh
- Configuring zsh
- Summary
- Chapter 2: Files and Directories
- Create, Copy, Remove, and Move Files
- Creating Text Files
- Copying Files
- Copy Files with Command Substitution
- Deleting Files
- Moving Files
- The ln Command
- The basename, dirname, and file Commands
- The wc Command
- The cat Command
- The more Command and the less Command
- The head Command
- The tail Command
- Comparing File Contents
- The Parts of a Filename
- Working with File Permissions
- The chmod Command
- Changing Owner, Permissions, and Groups
- The umask and ulimit Commands
- Working with Directories
- Absolute and Relative Directories
- Absolute/Relative Pathnames
- Creating Directories
- Removing Directories
- Navigating to Directories
- Moving Directories
- Using Quote Characters
- Streams and Redirection Commands
- Metacharacters and Character Classes
- Digits and Characters
- Filenames and Metacharacters
- Summary
- Chapter 3: Useful Commands
- The join Command
- The fold Command
- The split Command
- The sort Command
- The uniq Command
- How to Compare Files
- The od Command
- The tr Command
- A Simple Use Case
- The find Command
- The tee Command
- File Compression Commands
- The tar command
- The cpio Command
- The gzip and gunzip Commands
- The bunzip2 Command
- The zip Command
- Commands for zip Files and bz Files
- Internal Field Separator (IFS)
- Data from a Range of Columns in a Dataset
- Working with Uneven Rows in Datasets
- Summary
- Chapter 4: Conditional Logic and Loops
- Quick Overview of Operators in bash
- Arithmetic Operations and Operators
- The expr Command
- Arithmetic Operators
- Boolean and Numeric Operators
- Compound Operators and Numeric Operators
- Working with Variables
- Assigning Values to Variables
- The read Command for User Input
- Boolean Operators and String Operators
- Compound Operators and String Operators
- File Test Operators
- Compound Operators and File Operators
- Conditional Logic with if/else/fi Statements
- The case/esac Statement
- Working with Strings in Shell Scripts
- Working with Loops
- Using a for Loop
- Checking Files in a Directory
- Working with Nested Loops
- Using a while Loop
- The while, case, and if/elif/else/fi Statements
- Using an until Loop
- User-defined Functions
- Creating a Simple Menu from Shell Commands
- Arrays in bash
- Working with Arrays
- Summary
- Chapter 5: Filtering Data with grep
- What is the grep Command?
- Metacharacters and the grep Command
- Escaping Metacharacters with the grep Command
- Useful Options for the grep Command
- Character Classes and the grep Command
- Working with the -c Option in grep
- Matching a Range of Lines
- Using Back References in the grep Command
- Finding Empty Lines in Datasets
- Using Keys to Search Datasets
- The Backslash Character and the grep Command
- Multiple Matches in the grep Command
- The grep Command and the xargs Command
- Searching zip Files for a String
- Checking for a Unique Key Value
- Redirecting Error Messages
- The egrep Command and fgrep Command
- Displaying "Pure" Words in a Dataset with egrep
- The fgrep Command
- A Simple Use Case
- Summary
- Chapter 6: Transforming Data with sed
- What Is the sed Command?
- The sed Execution Cycle
- Matching String Patterns Using sed
- Substituting String Patterns Using sed
- Replacing Vowels from a String or a File
- Deleting Multiple Digits and Letters from a String
- Search and Replace with sed
- Datasets with Multiple Delimiters
- Useful Switches in sed
- Working with Datasets
- Printing Lines
- Character Classes and sed
- Removing Control Characters
- Counting Words in a Dataset
- Back References in sed
- Displaying Only "Pure" Words in a Dataset
- One-Line sed Commands
- Summary
- Chapter 7: Doing Everything Else with awk
- The awk Command
- Built-in Variables that Control awk
- How Does the awk Command Work?
- Aligning Text with the printf() Command
- Conditional Logic and Control Statements
- The while Statement
- A for Loop in awk
- A for Loop with a break Statement
- The next and continue Statements
- Deleting Alternate Lines in Datasets
- Merging Lines in Datasets
- Printing File Contents as a Single Line
- Joining Groups of Lines in a Text File
- Joining Alternate Lines in a Text File
- Matching with Metacharacters and Character Sets
- Printing Lines Using Conditional Logic
- Splitting Filenames with awk
- Working with Postfix Arithmetic Operators
- Numeric Functions in awk
- One-line awk Commands
- Useful Short awk Scripts
- Printing the Words in a Text String in awk
- Count Occurrences of a String in Specific Rows
- Printing a String in a Fixed Number of Columns
- Printing a Dataset in a Fixed Number of Columns
- Aligning Columns in Datasets
- Aligning Columns and Multiple Rows in Datasets
- Removing a Column from a Text File
- Subsets of Column-aligned Rows in Datasets
- Counting Word Frequency in Datasets
- Displaying Only "Pure" Words in a Dataset
- Working with Multi-line Records in awk
- A Simple Use Case
- Another Use Case
- Summary
- Chapter 8: Introduction to Shell Scripts and Functions
- What are Shell Scripts?
- A Simple Shell Script
- Setting Environment Variables via Shell Scripts
- Sourcing or "Dotting" a Shell Script
- Working with Functions in Shell Scripts
- Passing Values to Functions in a Shell Script (1)
- Passing Values to Functions in a Shell Script (2)
- Iterate Through Values Passed to a Function
- Positional Parameters in User-defined Functions
- Shell Scripts, Functions, and User Input
- Recursion and Shell Scripts
- Iterative Solutions for Factorial Values
- Calculating Fibonacci Numbers
- Calculating the GCD of Two Positive Integers
- Calculating the LCM of Two Positive Integers
- Calculating Prime Divisors
- Summary
- Chapter 9: Shell Scripts with the grep and awk Commands
- The grep Command
- Simulating Relational Data with the grep Command
- Checking Updates in a Logfile
- Processing Multi-line Records
- Adding the Contents of Records
- Using the split Function in awk
- Scanning Diagonal Elements in Datasets
- Adding Values From Multiple Datasets (1)
- Adding Values from Multiple Datasets (2)
- Adding Values from Multiple Datasets (3)
- Calculating Combinations of Field Values
- Summary
- Chapter 10: Miscellaneous Shell Scripts
- Using rm and mv with Directories
- Using the find Command with Directories
- Creating a Directory of Directories
- Cloning a Set of Subdirectories
- Executing Files in Multiple Directories
- The case/esac Command
- Compressing and Uncompressing Files
- The dd Command
- The crontab Command
- Uncompressing Files as a cron Job
- Scheduled Commands and Background Processes
- How to Schedule Tasks
- The nohup Command
- Executing Commands Remotely
- How to Schedule Tasks in the Background
- How to Terminate Processes
- Terminating Multiple Processes
- Process-Related Commands
- How to Monitor Processes
- Checking Execution Results
- System Messages and Log Files
- Disk Usage Commands
- Trapping and Ignoring Signals
- Arithmetic with the bc and dc Commands
- Working with the date Command
- Print-related Commands
- Creating a Report with the printf() Command
- Checking Updates in a Logfile
- Listing Active Users on a Machine
- Miscellaneous Commands
- Summary
- Index
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