three-way-comparison becomes cmp.

   

#!/usr/bin/perl
#
use warnings;
print"Which came first, the chicken or the egg? ";
print "chicken" cmp "egg", "\n";
print "Are dogs greater than cats? ";
print "dog" gt "cat", "\n";
print "Is ^ less than + ? ";
print "^" lt "+", "\n";

1.	Compare integer value
2.	Compare string value
3.	Compare the first four decimal places
4.	Comparing Numbers for Equality
5.	Comparing Numbers for Inequality
6.	Equality Operators and Numeric Values
7.	Equality Operators and String Values
8.	If not equal
9.	Integer-comparison operators.
10.	Not equals operator: ne
11.	Perl's operators for numeric comparisons
12.	String comparison operator
13.	String- and numeric-comparison operators.
14.	Use eq to compare strings
15.	Using eq in statement
16.	Using ne in if statement
17.	cmp with or
18.	eq, ne, lt, gt operators
19.	<=> returns 0, -1 , or 1
20.	Relational Operators and Numeric Values
21.	Comparison Operators listing
22.	Don't use == when you should use eq!
23.	Relational Operators and String Values
24.	Relational Operators demo
25.	The numeric comparison operator evaluates its operands

three-way-comparison becomes cmp. : Comparison Operators « Language Basics « Perl

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