fork the new process on the perl side, instead of on the shell:
sub system_background {
my $pid = fork;
if(defined($pid) and $pid==0) {
exec(@_); exit(1)
}
$pid
}
for (...) {
my $child = system_background("perl test1.pl");
system "perl test2.pl");
...
my $result = waitpid($child, 0);
}
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