Hi rubystallion,
This solution define F1 as hash variable. Unfortunately not much simpler if simpler at all.
#!/usr/bin/perl -w
use strict;
my %F1;
my @recs;
while (my $line = <DATA>) {
chomp $line;
my @F = split '&', $line;
if ($. == 1) {
$F1{$_} = 0 for (@F);
}
die "NF mismatch" if keys %F1 != @F;
push @recs, \@F;
foreach (@F) {
$F1{$_}++ if exists $F1{$_};
}
}
for my $rec (@recs) {
for my $field (@$rec) {
print "$field\t" unless exists $F1{$field} and $F1{$field} ==
+ $.;
}
print "\n";
}
__DATA__
a=1&b=1&c=1&d=2&e=&f=3
a=1&b=2&c=3&d=2&e=&f=4
a=1&b=2&c=5&d=1&e=&f=5
Output:
b=1 c=1 d=2 f=3
b=2 c=3 d=2 f=4
b=2 c=5 d=1 f=5
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