Read the fucking manual.

my $pid = fork;
if ($pid) {
    # Parent.
} elsif (defined $pid) {
    # Child.
    # Don't forget to let it exit.
} else {
    # Error.
}

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Update -- Rep -14 -- Was that for using "fucking", or because I told where the answer is, or because of the clear example? Or did you all just downvote because I didn't say "hth"? 

2;0 juerd@ouranos:~$ perl -e'undef christmas'
Segmentation fault
2;139 juerd@ouranos:~$

[download]

In reply to Re: creating a fork process by Juerd
in thread creating a fork process by richp

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