You've got two questions there. I'm not sure I understand the first one, and I don't use eval much. So, I'll just try to answer the second one.

By default, die adds the file name and line number to the end of whatever message you give it, but it takes it off if the message has a newline (\n) at the end.

If you want to put the information somewhere in the middle of the message, the tokens __LINE__ and __FILE__ are the line number and filename. Use them like constants (outside of any quotes). $0 also contains the file name. If you're in a subroutine, you can use the caller function, which, if used in a list context, returns the package, file name, and line number that the current subroutine was called from.

--
-- Ghodmode
Blessed is he who has found his work; let him ask no other blessedness.
-- Thomas Carlyle

In reply to Re: die function by GhodMode
in thread die function by perladdict

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.