Would this approach be a helpful alternative? (I ask because I'm not sure I entirely understand your real problem space.)
use strict;
use warnings;
#1176332
my $cmd_1 = "perl D:/_scratch/1176332p2.pl"; # (renamed from OP's hel
+lo.pl)
open (CMD, "$cmd_1 2>&1|") or warn ("!!! Can't run program: $!\n");
while (my $line = <CMD>) {
print $line;
if ($line =~ m/^xyz/) {
print "\n Pretending to do some string manipulation\n";
} else {
print "(from $0): Nothing yet | ";
}
}
close CMD;
use strict;
use warnings;
# D:/_scratch/1176332p2.pl
$| = 1;
print "Hello World from 1176332 PART 2\n";
print "Sleeping 10 seconds \n";
for (1 .. 10) {
sleep 1;
print ". \n";
}
print "xyz \n";
Execution:
D:\_scratch>D:\_scratch\1176332.pl
Hello World from 1176332 PART 2
(from D:\_scratch\1176332.pl): Nothing yet | Sleeping 10 seconds
(from D:\_scratch\1176332.pl): Nothing yet | .
(from D:\_scratch\1176332.pl): Nothing yet | .
(from D:\_scratch\1176332.pl): Nothing yet | .
(from D:\_scratch\1176332.pl): Nothing yet | .
(from D:\_scratch\1176332.pl): Nothing yet | .
(from D:\_scratch\1176332.pl): Nothing yet | .
(from D:\_scratch\1176332.pl): Nothing yet | .
(from D:\_scratch\1176332.pl): Nothing yet | .
(from D:\_scratch\1176332.pl): Nothing yet | .
(from D:\_scratch\1176332.pl): Nothing yet | .
(from D:\_scratch\1176332.pl): Nothing yet | xyz
Pretending to do some string manipulation
D:\_scratch>
If I've misconstrued your question or the logic needed to answer it, I offer my apologies to all those electrons which were inconvenienced by the creation of this post.
check Ln42!
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