Very blind and weird-looking: 
open( FILE1, "file1.txt" ) or die "Unable to open file1.txt\n$!\n";
open( FILE2, "file2.txt" ) or die "Unable to open file2.txt\n$!\n";

my %hash;

@hash{ map{ chomp; $_ } <FILE1> } = 
  map { chomp; $_; } <FILE2>

[download]
Print to the third file as any of the above.

In reply to Re: adding text from different txt file into hash by Transient
in thread adding text from different txt file into hash by MrChat

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