Beefy Boxes and Bandwidth Generously Provided by pair Networks
go ahead... be a heretic
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??

Hello, everybody.

I am still understanding Perl, but what bothers me some examples with open filehandles closing them and the diamond operator with the special $^I variable. What bothers me: why using open for read and write when we can use <> ? The diamod did the better job for me actually.

Update on 28.09.2012

I`ve found an excersise in Lama book on page 168 in which as an extra credit at 4 and 5, I think was the using of the diamond operator. Solving these two ex-es, I`ve found out that diamond has some better feats than open/close ( for text files since you always read and write ( consider you`ve used the -i variable ), however you can miss the --rwx check of the file and try to process a root file or unreadable/writable one. However I think that both are useful for different tasks, I think I`ve solved my mystery about the diamond operator, also I was wondering ( by my assumption the answer is 'NO') if diamond can fseek the file or you can just match with __LINE__ variable... Open/close still puts a fpointer to the file while diamond is some kind of magic using a copy and original files... Maybe this is a strong point if you worry about losing a file. And... I doubt that diamond can open db and binary files, it`s just my guess, I may fail at it too.


In reply to Diamond or Open, Process, Close? by heatblazer

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!
  • 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, 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, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • Outside of code tags, you may need to use entities for some characters:
            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.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others taking refuge in the Monastery: (5)
    As of 2014-08-30 21:27 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      The best computer themed movie is:











      Results (294 votes), past polls