More on shells
Overview
Simple arithmetic
Arithmetic
expansion
Operators for arithmetic
expansion
The 'expr'
command
Pattern matching
Patterns
Examples of patterns
The case
statement
Entering and leaving the
shell
More about scripts with
options
Symbolic
links
Setting up terminals
Conventions used in
UNIX file systems
Summary
Exercises

Examples of patterns
[abc] 
matches a or b or c 
[lz] 
matches all lowercase letters l to z
inclusive 
[ACbk] 
matches uppercase letters A to C and
lowercase b to k 
[XYaz] 
matches X and Y and any lowercase
letter 
[az] 
matches any lowercase letter or a hyphen 
[!09] 
matches any character that is not a digit 
