if(@ARGV < 2){
die "Not enough arguments\n";
}
$sequence="";
$fastaID="";
open(FILE1,"$ARGV[0]") or die "No fasta file provided in command line: $!\n";
while ($line=<FILE1>){
chomp($line);
if ($line=~/^\s*$/){
next;
}elsif ($line=~/^>/){
@data=split(" ",$line);
$fastahash{$fastaID}=$sequence;
$sequence="";
$fastaID=$data[1];

}else{
$sequence .=$line;
$sequence=~s/\s*//g;

        }
$fastahash{$fastaID}=$sequence;
}

open(OUT,"$ARGV[1]") or die "No output file:$!\n";
open(FILE2,"$ARGV[2]") or die "No fasta file provided in command line: $!\n";
while($line2=<FILE2>){
chomp($line2);
if (exists $fastahash{$line2}){
print "$line2\t $sequence\n";
}
}

exit;

##</code><code>##

> 2056360012 1047627436237
yyyacgagchagshgashcgahcgac
acsasasasacsacsasasacaca
ascassacsaascascascascac
> 2056360013 1047627436238
xxxxcgagchagshgashcgahcgac
acsasasasacsacsasasacaca
ascassacsaascascascascac

##</code><code>##

2056360012
2056360013