Hi Nemo2, I was absent. You already have had some solutions. This is the way I used, using BioPerl.

use strict;
use Bio::DB::Fasta;

my $database;
my $fasta_library;
my %records;

#  name of the library file - (here it is hardcoded)
$fasta_library = 'Poptr1_FilteredModels_transcripts.fa';

# creates the database of the library, based on the file
$database = Bio::DB::Fasta->new("$fasta_library");

# now, it parses the file with the fasta headers you want to get
while (<STDIN>) {
    chomp (my $seq_id = $_);
    
    my $record = $database->get_Seq_by_id("$seq_id");
    
         # incorporates the header and sequence to the hash
         # key = header ; value = sequence
    $records{$seq_id} = $record->seq();

}

# print all the key-value pairs (
for (sort keys (%records)) {
    print ">$_\n$records{$_}\n";
}

exit;

[download]

In reply to Re^3: comparing two fasta files by rogerd
in thread comparing two fasta files by nemo2

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