Maybe this will give you some ideas:
#! /usr/bin/perl
my $tcpdump = '/usr/sbin/tcpdump -n'; # path and options
my $timeout = 5; # time to listen
my $fileout = 'out.tcpdump';
open(OUT, "> $fileout") || die $!;
open(CMD, "$tcpdump |") || die $!;
eval
{
local $SIG{ALRM}= sub { die('done') };
alarm( $timeout );
while (<CMD>)
{
my $line = $_;
print OUT $line;
}
alarm(0);
};
print $@ if $@;
close OUT || die $!;
Tiago
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