Beefy Boxes and Bandwidth Generously Provided by pair Networks
Clear questions and runnable code
get the best and fastest answer

Comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
Shouldn't this be fixed with 3-argument open?
Fixed implies broken. This feature is there by design, and predates perl5. I find it useful.
I really like the magic-diamond for quick one-liners, but this just sounds all the security/robustness alarm bells.
One-liners are one-liners. They are there for convenience. Writing secure and/or robust programs means you're going to put in more effort than a one-liner.

One of perl mottos is to make "easy things easy, and hard things possible". Magic open is a form of easy. Writing secure and robust programs is a hard thing. For that, you taint your command line arguments, and use 3-arg open. Note that a simple -T flag prevents your example from doing any harm:

$ perl -TwE '$ENV{PATH} = "/bin"; while (<>) {say}' '/bin/rm * |' Insecure dependency in piped open while running with -T switch at -e l +ine 1. $
Replacing magic open with 3-arg open means easy things are not so easy any more.

In reply to Re: magic-diamond <> behavior -- WHAT?! by JavaFan
in thread magic-diamond <> behavior -- WHAT?! by repellent

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, 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
  • 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.
  • Log In?

    What's my password?
    Create A New User
    and all is quiet...

    How do I use this? | Other CB clients
    Other Users?
    Others chanting in the Monastery: (5)
    As of 2018-06-20 04:30 GMT
    Find Nodes?
      Voting Booth?
      Should cpanminus be part of the standard Perl release?

      Results (116 votes). Check out past polls.