There are two problems with that:

1) Creating symbols dynamically (FH$i) is pretty bad. I think you could use $FH{$i} instead (since Perl 5.6?), but your loop would become
while (<$FH{''}>) { print $FH{1} $_; }

2) You're opening both files for reading.

In reply to Re^3: Collapsing multiple file open/close by ikegami
in thread Collapsing multiple file open/close by ady

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