I found how to do this on a basic level via PATH=$PATH:/usr/perl5/bin; perloc -h hex I found the hex function within "Perl In A Nutshell" Here's my contribution: 
bash-3.00# vi 2hex
"2hex" 12 lines, 191 characters
#!/usr/bin/perl


$deca=hex("0x175");
$decb=hex("0x1aa");

print "0x175 hex is $deca in decimal\n";
print "0x1aa hex is $decb in decimal\n";


$diff = $decb - $deca;

print "the difference is $diff\n";

[download]
---end ---

In reply to Re: Subtract 2 hexadecimal numbers by AlbinoSleestak
in thread Subtract 2 hexadecimal numbers by samd

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.