Perl Programming/Concept Index/case sensitivity

The perl interpreter is case sensitive. This means that identifier names containing lowercase letters will be treated as being different and separate from those containing uppercase letters:

$dog='Benjamin'; $Dog='Samba'; $DOG='Bernie'; print "The dogs are named $dog, $Dog, and $DOG \n"
 * 1) These variables are all different

Converting Strings
The perl interpreter provides the following functions for converting strings to uppercase or to lowercase: uc 	Converts a string to upper case lc 	Converts a string to lower case ucfirst 	Converts the first letter of a string to upper case lcfirst 	Converts the first letter of a string to lower case