What is "mandatory" and "optional" is not the option itself (options are by their nature always optional) but rather the associated argument.

That is, --option without an argument will be an error on option=s or option=i, but will give the empty string on option:s and zero on option:i.

(A missing --option or an option with argument (--option=42) will be treated the same by both.)

Try @ARGV = qw( --tag ); with your cases 5 and 6, and you'll see the behaviour you expected.

print "Just another Perl ${\(trickster and hacker)},"
The Sidhekin proves Sidhe did it!


In reply to Re: Trying to understand subtleties of Getopt::Long, please help by Sidhekin
in thread Trying to understand subtleties of Getopt::Long, please help by Rudif

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.