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in reply to How do I read the files in @ARGV one by one

How do you distinguish filenames from contents of files in your data structure? A hash of arrays is cleaner.

The following snippet should work: 

$data{$_} = [] foreach @ARGV;
while (<>) {
  push @{$data{$ARGV}}, $_;
}

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The purpose of the first line is to make sure that files which are empty are included in your hash.

In Section Seekers of Perl Wisdom