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my $pseudo_file = "line1\nline2\n";
open my $rfd, '<', \$pseudo_file or die "open1: $!";
open my $wfd, '>', 'foo' or die "open2: $!";
print $wfd $_ while <$rfd>;      ## or 'print $wfd (<$rfd>);' if file 
+isn't large
close $wfd;
close $rfd;

open my $fh, '<', \$pseudo_file_already_generated or die "open: $!";
$ftp->login("perl",'monk') or die "blah";
$ftp->put($fh, 'fh.txt') or warn "blah";
$ftp->quit;