how do you set ulimit -n 5000 in perl.

How do I set "ulimit -n 5000" in perl so that it
takes affect for child processes.
I tried `ulimit -n 5000` (backtics) but a
subsequent `ulimit -n` showed the value
set back to the default.      
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install BSD::Resource


use BSD::Resource;

$LIM = get_rlimits();
($soft, $hard) = getrlimit($lim);
setrlimit($lim, 9000, $hard);

add error checking everythere.
Perl doesn't have direct interface to ulimit

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Another option is to set your ulimit prior to running your perl program.  Make sure you use the #!/usr/bin/perl shebang line and run perl so that it does not spawn a new shell like this:
ulimit -n 5000; ./

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