Perl Programming/Concept Index/case sensitivity

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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:

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

Converting Strings[edit]

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