Assuming your file is not millions of lines, try this

#!perl
use strict;
use warnings;

my $infile  = 'rangeFile.txt';
my $outfile = 'test.txt';

open IN, '<', $infile or die "Cannot Open InFile: $infile : $!";
open OUT, '>', $outfile or die "Cannot Open OutFile: $outfile : $!";

my %out=(); 
my @key=();
my $count_in  = 0;
my $count_out = 0;

# input
while (<IN>){
  chomp;
  ++$count_in;
  my @in = split ',',$_;
  my $key = join ',',@in[0..2];
  
  if ( ! defined $out{$key} ){
    # initialise
    @{$out{$key}} = @in[3..4];
    push @key,$key; # preserve order
  } else {
  
    # min
    if ($in[3] < $out{$key}[0]){
      $out{$key}[0] = $in[3];   
    }
    
    # max
    if ($in[4] > $out{$key}[1]){
      $out{$key}[1] = $in[4];
    }
  } 
  
}

# output
for my $key (@key){
  print OUT join ',',$key,@{$out{$key}},"\n";
  ++$count_out;
}

close IN;
close OUT;
print "
$count_in records read from $infile
$count_out records written to $outfile\n";

__DATA__
IMB,060410,V1 ,371094378,371096338,1961
IMB,060410,V1 ,371096340,371096486,147
IMB,107951,V1 ,981157588,981164939,7352
IMB,107951,V1 ,981164941,981165606,666
IMB,107951,V1 ,981165608,981175100,9493
IMB,107951,V1 ,981175102,981176199,1098
IMB,060410|,folded   ,307057959,307058193,235
IMB,060410|,selfmail ,307058194,307066458,8265
IMB,107951|,folded   ,958090350,958091491,1142
IMB,107951|,selfmail ,958091492,958132856,41365
SEQ,,folded    ,000000001,000001377,1377
SEQ,,selfmail  ,000001378,000051007,49630

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poj

In reply to Re^5: Combined lines from a file into one by poj
in thread Combined lines from a file into one by emadmahou

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