I guess it is working now, but I might have another problem in my script, as I am not getting the expected result. My whole code is: 

#!/usr/bin/perl                                                       
+                                
#network_coco.plx                                                     
+                                

use warnings;
use strict;                                                           
+                            

open(DATAIN, "<$ARGV[0]")||die"cannot open \"ARGV[0]\":$!";
open(DATAOUT2, ">>cococount.txt")||die"$!\n";
                                                                      
+                           

for(my $count=0.9; $count<=0.95; $count=$count+0.01)
{
    open(DATAOUT, ">variable")||die"$!\n";

    while(<DATAIN>)
    {
        my @line=split (/\t/);

        if($line[2] >= $count)
        {
            print DATAOUT;
        }
    }

    close(DATAOUT);

    system ("clm close -abc variable --is-undirected --write-count -cc
+-bound 5 > var2");

#clm close reads file variable, and gives back an integer             
+                                                                 

    open(VAR2, "<var2")||die"$!\n";

    while (<VAR2>)
    {
        chomp;
        print DATAOUT2 "$count\t$_\n";
    }
    close(VAR2);
}
                                                                      
+ 
close(DATAOUT2);

[download]
What I want is a the file cococount.txt containing: 
0.9 (tab) 13
0.91 (tab) 9
0.92 (tab) 7
0.93 (tab) 8
0.94 (tab) 5
0.95 (tab) 4

And what I get is:

0.9 (tab) 13
0.91 (tab) 0
0.92 (tab) 0
0.93 (tab) 0
0.94 (tab) 0

[download]
I guess the problem should be overwritting file "variable". Also, I do not get the final line : 0.95 ... Any ideas? Many thanks, Hernando

In reply to split function by herny

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