in reply to doing a search and replace on a large file

An example how I skip on a couple of conditions:
use strict; my ($inputfile, $outputfile) = @_; open (OUT, ">$outputfile") || die "could not open $outputfile\n"; open (IN, "<$inputfile") || die "could not open $inputfile\n"; while (<IN>) { chomp; # no newline s/^--.*//; # no oracle comments s/^prompt.*//; # no oracle prompt lines s/^\s+//; # no leading white s/\s+$//; # no trailing white s/\s+/ /; # replace series of white with one spac +e next unless length; # anything left? print OUT $_, "\n"; } close IN; close OUT;