If you put \xd1 on the command line, your program will see that literally. In order to match it literally, you have to say

use constant HEXD1 => "\\xd1";

Or something like that. You're right that the code is a little strange. I think you'll find it much simpler to say:

    # from the command line
    perl d1
    perl d3

    # in the code
    my $arg = hex(shift @ARGV);

[download]

update: almut is absolutely correct, that should read

    my $arg = chr(hex(shift @ARGV));

[download]

or even

    my $arg = chr hex shift;

[download]

... but I didn't want to obsfuscate the code unnecessarily (shift of what?)

• another intruder with the mooring in the heart of the Perl

In reply to Re: Help reg printing non printable hex characters by grinder
in thread Help reg printing non printable hex characters by user1357

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.