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my $pid;
if (($pid = fork()) == 0) {
...
# dosomething with $pid...
my $is_alive = kill 0, $pid;  # see if still alive
kill 15, $pid;                # send a SIGTERM

my $pid = open(FH,"process @args |"); # to read from it
my $pid = open(FH,"| process @args"); # to write to it