my $pid=fork();
if ( $pid == 0 } {
   : child process goes here
} elsif { $pid > 0 ) {
   : parent process
    wait();  # Wait for the child to exit
} else {
    # WOAH! We should never get here! 
    die "fork returned $pid";
}

[download]
There are two things wrong with that. If the fork fails, $pid is undef, but will still compare true to 0. Second, if it fails, the error is in $!, not $pid. So you actually want: 
my $pid=fork();
if (not defined $pid) {
    die "fork failed: $!\n";
}
elsif ( $pid == 0 } {
   : child process goes here
}
else {
   : parent process
    wait();  # Wait for the child to exit
}

[download]

Dave.

In reply to Re^2: quoted execution not working by dave_the_m
in thread quoted execution not working by gri6507

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.