I can tell you that C, C++, C#, Java, Perl and Python all read files in a start to finish manner.

I guess you meant "once only" instead of start to finish. That's fair enough, but if a command is going to fail, perl might as well give me some information about it. When you try to read a filehandle that never even existed, you get an "unopened filehandle" error message. I don't see why you shouldn't get an error message about an "already read" or "expired", "inactive" filehandle or something to that effect instead of the command failing silently, which makes debugging a nightmare.

In reply to Re^4: Trying to do multiple while loops on the same input file by elef
in thread Trying to do multiple while loops on the same input file by elef

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.