Book Image

Linux Command Line and Shell Scripting Bible - Third Edition

By : Richard Blum, Christine Bresnahan
Book Image

Linux Command Line and Shell Scripting Bible - Third Edition

By: Richard Blum, Christine Bresnahan

Overview of this book

The Linux command line enables you to type specific shell commands directly into the system to manipulate files and query system resources. Command line statements can be combined into short programs called shell scripts, a practice increasing in popularity due to its usefulness in automation. Linux is a robust system with tremendous potential, and Linux Command Line and Shell Scripting Bible opens the door to new possibilities. Linux Command Line and Shell Scripting Bible is your essential Linux guide. It contains new functional examples that are fully updated to align with the latest Linux features. Beginning with command line fundamentals, the book moves into shell scripting and shows you the practical application of commands in automating frequently performed functions. This book is a complete guide providing detailed instruction and expert advice working within this aspect of Linux. Whether used as a tutorial or as a quick reference, this book contains information that every Linux user should know.
Table of Contents (34 chapters)
2
Part I: The Linux Command Line
13
Part II: Shell Scripting Basics
20
Part III: Advanced Shell Scripting
28
Part IV: Creating Practical Scripts
32
End User License Agreement

Reviewing Built-In Commands

The bash shell includes many popular commands built into the shell. This provides for faster processing times when using these commands. Table A.1 shows the built-in commands available directly from the bash shell.

Table A.1 bash Built-In Commands

Command Description
: Expands listed arguments and redirects as specified
. Reads and executes commands from a designated file in the current shell
alias Defines an alias for the specified command
bg Resumes a job in background mode
bind Binds a keyboard sequence to a readline function or macro
break Exits from a for, while, select, or until loop
builtin Executes the specified shell built-in command
caller Returns the context of any active subroutine call
cd Changes the current directory to the specified directory
Command Description
command Executes the specified command without the normal shell lookup
compgen Generates possible completion matches for the specified word
complete Displays...