Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl: the Markov chain saw
 
PerlMonks  

Comment on

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

You are assuming that the current operating system has the "cat" command, and has it in the current $PATH (or whatever Windows uses).

It also costs a fork/exec which seems very costly to me compared to opening and slurping in a file.

It may be fewer characters to type, but it probably gets terrible performance (where that's a concern) and is not portable (where that's a concern).

I distinctly remember some package having a simple file slurp method which makes this even simpler, but I don't remember if it was specific to an Apache related module or if it could be used in any environment. Not too hard to write one if you do this often, though.

Oh, yeah, just because a file exists (-f) doesn't mean that it is readable. You might want to change the code to use -r to decrease the risk that the cat command will fail.

On the topic of "sort", I have been known to recommend running the external command instead of doing a sort inside of Perl. It mainly depends on how large the data set is and how complex the sorting criteria.

-- Eric Hammond


In reply to Re: Re: Perl Idioms Explained - my $string = do { local $/; <FILEHANDLE> }; by esh
in thread Perl Idioms Explained - my $string = do { local $/; <FILEHANDLE> }; by jeffa

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 romping around the Monastery: (7)
    As of 2014-09-21 16:04 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      How do you remember the number of days in each month?











      Results (172 votes), past polls