Shell Commands and Expansions Overview
Explore the world of Linux shell commands and expansions through examples of echo, pathname, tilde, arithmetic, brace, parameter, double quotes, single quotes, and escape characters. Understand how to manipulate text strings and variables efficiently within the shell environment.
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Presentation Transcript
The Linux Command Line Chapter 7 Seeing The World As The Shell Sees It Prepared by Dr. Reyes, New York City College of Technology
Expansion echo command that displays a line of text echo can be combined with wildcards
Arithmetic Expansion Uses the form $((expression)) Operators supported:
Brace Expansion Used to create multiple text strings from a pattern containing braces. Examples:
Parameter Expansion Given a variable, place a $ to retrieve its value Example:
Double Quotes Double quotes when used, all the special characters used by the shell lose their special meaning and are treated as ordinary characters except for $ , \ (backslash), and ` (backquote). Examples:
Single Quotes Single quotes used to suppress all expansions Example double vs. single quotes
Escape Characters Escape character use the backslash \ before $ , ! , & , , and other characters with special meaning. Other escape sequences
