Book Image

Command Line Fundamentals

By : Vivek Nagarajan
Book Image

Command Line Fundamentals

By: Vivek Nagarajan

Overview of this book

The most basic interface to a computer—the command line—remains the most flexible and powerful way of processing data and performing and automating various day-to-day tasks. Command Line Fundamentals begins by exploring the basics, and then focuses on the most common tool, the Bash shell (which is standard on all Linux and iOS systems). As you make your way through the book, you'll explore the traditional Unix command-line programs as implemented by the GNU project. You'll also learn to use redirection and pipelines to assemble these programs to solve complex problems. By the end of this book, you'll have explored the basics of shell scripting, allowing you to easily and quickly automate tasks.

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Table of Contents (6 chapters)
Preface
Preface
About the Book
Free Chapter
1
Introduction to the Command Line
Introduction to the Command Line
Introduction
Command Line: History, Shells, and Terminology
Exploring the Filesystem
Shell History Recall, Editing, and Autocompletion
Shell Wildcards and Globbing
Summary
2
Command-Line Building Blocks
Command-Line Building Blocks
Introduction
Redirection
Pipes
Text-Processing Commands
Summary
3
Advanced Command-Line Concepts
Advanced Command-Line Concepts
Introduction
Command Lists
Job Control
Regular Expressions
Shell Expansion
Summary
4
Shell Scripting
Shell Scripting
Introduction
Conditionals and Loops
Shell Functions
Shell Line Input
Shell Scripts
Practical Case Study 1: Chess Game Extractor
Tips and Tricks
Practical Case Study 2: NYC Yellow Taxi Trip Analysis
Summary
Appendix
Appendix
Chapter 1: Introduction to the Command Line
Chapter 2: Command-Line Building Blocks
Chapter 3: Advanced Command-Line Concepts
Chapter 4: Shell Scripting

Chapter 2: Command-Line Building Blocks

Activity 6: Processing Tabular Data – Reordering Columns

  1. The following commands are to be used in the given order:
    robin ~/Lesson2 $ tail -n+2 land.csv | sort >sorted.txt
robin ~/Lesson2 $ cat -n sorted.txt >numbered.txt
robin ~/Lesson2 $ cat -T numbered.txt | head -n3
  1^IAfghanistan,AFG,1961,57.7459179609717
  2^IAfghanistan,AFG,1962,57.8378212786815
  3^IAfghanistan,AFG,1963,57.914407376773
robin ~/Lesson2 $ tr ',' '\t' <numbered.txt >tabbed.txt
robin ~/Lesson2 $ cat -T tabbed.txt | head -n3
  1^IAfghanistan^IAFG^I1961^I57.7459179609717
  2^IAfghanistan^IAFG^I1962^I57.8378212786815
  3^IAfghanistan^IAFG^I1963^I57.914407376773
robin ~/Lesson2 $ join -o1.4,1.5,1.3 tabbed.txt tabbed.txt >342.txt
robin ~/Lesson2 $ join -o1.5,1.4,1.2 tabbed.txt tabbed.txt >431.txt
  2. To view the expected content in the two output files, use the following...
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