if ($string1 eq $string2){
    print"\$string1 is equal to \$string2\n";
}
elsif ($string1 lt $string2){
    print"\$string1 is less than \$string2\n";
}
elsif ($string1 gt $string2){
    print"\$string1 is greater than \$string2\n";
}
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== tests equality for numbers.
eq does the same for strings.
lt is the string testing equivalent of the numerical <
gt is the string testing equivalent of the numerical >

You can also use the cmp operator, which is the non-numerical equivalent of the <=> operator:

$result = $string1 cmp $string2;
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$result will be:

• 0 if the strings are equal
• 1 if string1 is greater than string2
• -1 if string1 is less than string2