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Linux Processes
- What is a Process?
- Process Structure
- The ps Utility
- Options to the ps Utility
- Background Commands (&)
- Killing Background Processes
- Redirecting the Standard Error
Getting Started
- What is a Shell?
- Running Scripts
- Specifying the Script's Interpreter
- The PATH Environment Variable
- Sub-shells
Variables
- Shell Variables
- The read Command
- The export Command
- The Shell Environment
- Variable Substitution
- Command Substitution
The Login Process
- The Login Process
- The System Profile Script
- Your .profile Script
- The . Command
Conditional Statements
- The Exit Status of Commands
- Command Line Examples
- The test Command
- The if-then-else Construct
- The elif Construct
- case Statements
Loops
- The for Loop
- The while Loop
- Reading Lines From Files
- Using Arrays with Loops
Special Variables
- $$ - PID of Shell
- Command-Line Arguments
- $# - Number of Arguments
- $* - All Arguments
- The shift Command
- The set Command
- Getting Options
Quoting Mechanisms
- Single vs. Double Quotes
- What is a Here Document?
- Using a Here Document
- Here Document Quoting
- Ignoring Leading Tabs
Functions
- Shell Functions
- Passing Arguments to Functions
- Returning Values from Functions
- Function Libraries
Advanced Programming
- Shell Arithmetic
- The select Statement
- Terminal Independence in Scripts
- The eval Command
Debugging Techniques
- Using echo
- Using Standard Error
- Options for Debugging
- Script Tracing
- Conditional Debugging
Shell IPC
- Co-processes
- The print and read Commands
- Signals
- The trap Command
- Named Pipes
- The wait Command
Data Munging
- Regular Expression Overview
- Regular Expressions
- RE Character Classes
- RE Quantifiers
- RE Parenthesis
- Searching Inside Files
- Replacing Text Characters
- The Streaming Editor (sed)
- Text Processing with awk
- Text Sorting
- Duplicate Removal Utility
- Extracting Columns of Text
Security, Whitespace And Other Gotchas
- Gotchas: Maximum Command Length
- Gotcha: Whitespace in for Loops
- Gotcha: $IFS
- Gotcha: Printing in .bashrc
- Gotcha: Aliases
Administering the Linux System by Using Shell Scripts
- Manage Services
- Monitor System Resources
- Manage System Logs
- Manage Users and Groups
Performing Backups Using Shell Scripts
- Create Simple Backup Scripts
- Specify the Backup Source and Destination Interactively
- Manage Logs
- Restore Files
Packaging Shell Programs
- Create Portable Shell Scripts
- Create Shell Wrappers
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