Well, I didn't realize your input files were all newline free.. Should have read the question more closely.
In that case, Bioperl is even better...
use Bio::SeqIO;
while (my $fname = shift) {
## raw is one seq per line (no newlines)
my $in = Bio::SeqIO->new(-file => "$fname",
'-format' => 'raw');
$fname =~ s{\.txt}{}' # strip .txt
my $outfile = $fname . ".fa";
my $out = Bio::SeqIO->new(-file => "> $outfile" ,
'-format' => 'fasta');
## Do the conversion
while ( my $seq = $in->next_seq() ) {
$seq->display_id($fname); # Add a name
$out->write_seq($seq);
}
}
Run it in the same way, with an argument of *.txt
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