Dynamic arguments passed to a script from the command line (e.g., $1 , $2 , $* ). 4. Control Structures and Decision Making
: Using the test command or [ ] brackets to evaluate conditions.
: Background processing using & , tracking Process IDs (PIDs), and handling signals via trap .
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Kanetkar splits the material into two structural segments to build competency sequentially.
Handling command-line arguments effectively.
To be transparent, the book is not perfect. Because it was written in the early 2000s, it does not cover: Dynamic arguments passed to a script from the
A common task for system administrators is backing up a directory and compressing it to save space.
Kanetkar’s signature approach relies heavily on practical examples. Below are two classic shell script examples modeled after the concepts taught in the book. Example 1: A Basic File Backup Script
To illustrate how Kanetkar teaches optimization, consider this practical backup and cleanup script. It demonstrates variable assignment, conditional testing, and loop execution. : Background processing using & , tracking Process
Using while , until , and for loops to iterate through lists, files, or specific numerical ranges.
Before diving into code, Kanetkar ensures readers understand the essential command-line tools. You will learn to navigate the hierarchical file system using standard utilities: ls (list directories) cd (change directories) pwd (print working directory) cp , mv , rm (copy, move, and remove files) 3. Filters and Redirection
Conditional execution and looping mechanics allow shell scripts to handle complex decision-making processes. Conditional Statements
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