• Shell Script Dialects

• She Sells C Shells

• Tips for Shell Users

• Shell Variables and Printing

• Exporting Shell Variables

• Shell Script Input and Output Using printf and read

• Bulk I/O Using the cat Command

• Pipes and Redirection

• Basic Control Statements

• Variables, Expansion, and Quoting

• Working With Result Codes

• Basic Subroutines

• Anonymous Subroutines

• Variable Scoping

• Including One Shell Script Inside Another

• Background Jobs and Job Control

• The expr Command Also Does Math

• The Easy Way: Parentheses

• Other Comparisons

• Beyond Basic Math

• Regular Expression Syntax

• Positional Anchors and Flags

• Wildcards and Repetition Operators

• Character Classes and Groups

• Quoting Special Characters

• Capture Operators and Variables

• Mixing Capture and Grouping Operators

• Perl and Python Extensions

• A Simple awk Script

• Conditional Filter Rules in awk

• Changing the Record and Field Separators in awk

• Skipping Records and Files

• Control Statements in awk

• Functions in awk

• Working with Arrays in awk

• File Input and Output

• Bourne Shell Version

• Managing Users and Groups

• Working with Device I/O

• Disk Management and Partitioning

• File System Hierarchy

• General Command-Line Tool Differences

• Data Structures, Arrays, and Indirection

• Nonblocking I/O

• Timing Loops

• Trapping Signals

• Special Shell Variables

• Shell Text Formatting

• Avoiding Unnecessary External Commands

• Other Performance Tips

• General Tools

• Text Processing Tools

• File Commands

• Disk Commands

• Archiving and Compression Commands

• For More Information

• Obtaining Random Numbers

• Finding The Ordinal Rank of a Character

• Complete Code Sample