I was trying to count lines in a file, AFAP.

Why didn't this work: 

time perl -e '$_=[];{$/=\000,@$_=<>}; my $count=@$_;print $count, " li
+nes\n";' </tmp/16   
1 lines
0.47sec 0.28usr 0.18sys (99.77% cpu)

[download]
A correct solution (that takes the same time?) 
time perl -e '{$/=undef, $_=<>} my $count=split /\000/,$_; print $coun
+t, " lines\n";' </tmp/16
4118704 lines
0.47sec 0.28usr 0.18sys (99.77% cpu)

[download]
Shouldn't the first have read it into a temp array pointed to by $_, then got the count from @$_?

FWIW, also tried binmode STDIN at the front - same thing. What am I forgetting?

In reply to Why doesn't this work? by perl-diddler

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.