Shell Programming in Unix, Linux and OS X · 4th Edition (Shannon Powell's Library) by Kochan, Stephen G. -- Read -- Imperial Library of Trantor

Index

About This E-Book Title Page Copyright Page Developer’s Library Contents at a Glance Table of Contents About the Authors We Want to Hear from You! Reader Services Introduction

How This Book Is Organized Accessing the Free Web Edition

1. A Quick Review of the Basics

Some Basic Commands

Displaying the Date and Time: The date Command Finding Out Who’s Logged In: The who Command Echoing Characters: The echo Command

Working with Files

Listing Files: The ls Command Displaying the Contents of a File: The cat Command Counting the Number of Words in a File: The wc Command Command Options Making a Copy of a File: The cp Command Renaming a File: The mv Command Removing a File: The rm Command

Working with Directories

The Home Directory and Pathnames Displaying Your Working Directory: The pwd Command Changing Directories: The cd Command More on the ls Command Creating a Directory: The mkdir Command Copying a File from One Directory to Another Moving Files Between Directories Linking Files: The ln Command Removing a Directory: The rmdir Command

Filename Substitution

The Asterisk Matching Single Characters

Filename Nuances

Spaces in Filenames Other Weird Characters

Standard Input/Output, and I/O Redirection

Standard Input and Standard Output Output Redirection Input Redirection

Pipes

Filters

Standard Error More on Commands

Typing More Than One Command on a Line Sending a Command to the Background The ps Command

Command Summary

2. What Is the Shell?

The Kernel and the Utilities The Login Shell Typing Commands to the Shell The Shell’s Responsibilities

Program Execution Variable and Filename Substitution I/O Redirection Hooking up a Pipeline Environment Control Interpreted Programming Language

3. Tools of the Trade

Regular Expressions

Matching Any Character: The Period (.) Matching the Beginning of the Line: The Caret (^) Matching the End of the Line: The Dollar Sign $ Matching a Character Set: The [...] Construct Matching Zero or More Characters: The Asterisk (*) Matching a Precise Number of Subpatterns: \{...\} Saving Matched Characters: $...$

cut

The -d and -f Options

paste

The -d Option The -s Option

sed

The -n Option Deleting Lines

The -s Option The –d Option

grep

Regular Expressions and grep The -v Option The -l Option The -n Option

sort

The -u Option The -r Option The -o Option The -n Option Skipping Fields The -t Option Other Options

uniq

The -d Option Other Options

4. And Away We Go

Command Files

Comments

Variables

Displaying the Values of Variables Undefined Variables Have the Null Value Filename Substitution and Variables The ${variable} Construct

Built-in Integer Arithmetic

5. Can I Quote You on That?

The Single Quote The Double Quote The Backslash

Using the Backslash for Continuing Lines The Backslash Inside Double Quotes

Command Substitution

The Back Quote The $(...) Construct The expr Command

6. Passing Arguments

The $# Variable The $* Variable A Program to Look Up Someone in the Phone Book A Program to Add Someone to the Phone Book A Program to Remove Someone from the Phone Book

${n}

The shift Command

7. Decisions, Decisions

Exit Status

The $? Variable

The test Command

String Operators An Alternative Format for test Integer Operators File Operators The Logical Negation Operator ! The Logical AND Operator –a Parentheses The Logical OR Operator –o

The else Construct The exit Command

A Second Look at the rem Program

The elif Construct

Yet Another Version of rem

The case Command

Special Pattern-Matching Characters The -x Option for Debugging Programs Back to the case

The Null Command : The && and || Constructs

8. 'Round and 'Round She Goes

The for Command

The $@ Variable The for Without the List

The while Command The until Command More on Loops

Breaking Out of a Loop Skipping the Remaining Commands in a Loop Executing a Loop in the Background I/O Redirection on a Loop Piping Data into and out of a Loop Typing a Loop on One Line

The getopts Command

9. Reading and Printing Data

The read Command

A Program to Copy Files Special echo Escape Characters An Improved Version of mycp A Final Version of mycp A Menu-Driven Phone Program The $$ Variable and Temporary Files The Exit Status from read

The printf Command

10. Your Environment

Local Variables

Subshells

Exported Variables

export -p

PS1 and PS2 HOME PATH Your Current Directory

CDPATH

More on I/O

<&- and >&- In-line Input Redirection Shell Archives

Functions

Removing a Function Definition The return Command

The type Command

13. Rolo Revisited

Data Formatting Considerations rolo add lu display rem change listall Sample Output

14. Interactive and Nonstandard Shell Features

Getting the Right Shell The ENV File Command-Line Editing Command History The vi Line Edit Mode

Accessing Commands from Your History

The emacs Line Edit Mode

Accessing Commands from Your History

Other Ways to Access Your History

The history Command The fc Command The r Command

Functions

Local Variables Automatically Loaded Functions

Integer Arithmetic

Integer Types Numbers in Different Bases

The alias Command

Removing Aliases

Arrays Job Control

Stopped Jobs and the fg and bg Commands

Miscellaneous Features

Other Features of the cd Command Tilde Substitution Order of Search

Compatibility Summary

A. Shell Summary

Startup Commands Comments Parameters and Variables

Shell Variables Positional Parameters Special Parameters Parameter Substitution

Command Re-entry

The fc Command vi Line Edit Mode

Quoting

Tilde Substitution Arithmetic Expressions

Filename Substitution I/O Redirection Exported Variables and Subshell Execution

The (...) Construct The { ...; } Construct More on Shell Variables

Functions Job Control

Shell Jobs Stopping Jobs

Command Summary

The : Command The . Command The alias Command The bg Command The break Command The case Command The cd Command The continue Command The echo Command The eval Command The exec Command The exit Command The export Command The false Command The fc Command The fg Command The for Command The getopts Command The hash Command The if Command The jobs Command The kill Command The newgrp Command The pwd Command The read Command The readonly Command The return Command The set Command The shift Command The test Command The times Command The trap Command The true Command The type Command The umask Command The unalias Command The unset Command The until Command The wait Command The while Command

B. For More Information

Online Documentation Documentation on the Web Books

O’Reilly & Associates Pearson

Index Inside Front Cover Inside Back Cover Code Snippets

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