file name1:seq.txt
-------------------
>ID_101
AGCTGAGTAGACTGA
>ID_102
CGATGCTAGCTAGCTACAT
>ID_103
ATCTTATCTTTTTATACC

file name2:seq_updated.txt
--------------------------
>ID_104
AATAGCTAGAAGGA
>ID_105
AGATCGACTGAA
>ID_106
ACTAGCTACGATATATTATATATAT

my php page:
-----------
$foo="ID_106" //ID to be searched.
$cmd="perl split.pl $foo";
echo exec($cmd);

my perl program:
---------------
$bar=$ARGV[0];
print exec("grep -h -A 1 $bar *.txt");


##</code><code>##

what i was planning to do with the variable is this:
----------------------------------------------------
foreach $str(@array){
	if($str=~/\w+/){@strs=split(//,$str);
	for($i=1;$i<=scalar(@strs);$i++){
		print "$strs[$i] ";
		if($i%5==0){print"\n";}			
	}
  }
}
}

this is how my webpage result should look like:
-----------------------------------------------
>ID_106
ACTAG
CTACG
ATATA
TTATA
TATAT