use strict; use warnings; 
my %HoA;

while (my $line = <DATA>) {
        chomp $line;
	my ($col1,$restcol) = split /:\s*/, $line ,2;
	my ($col2,$col3) = split ' ', $restcol,2;
	push @{$HoA{$col1}{$col2}},$col3; 
}

print "Dumping Output \n";
for my $col1 (sort keys %HoA) {
    my $c1txt=$col1; 
    for my $col2 (sort keys %{$HoA{$col1}}) {
      my $c2txt=$col2; 
      for my $col3 (@{$HoA{$col1}{$col2}}) { 
        printf "%-22s %-22s %-22s \n",$c1txt,$c2txt,$col3;
        $c1txt=''; 
        $c2txt=''; 
        } 
     }
}

__DATA__
ULTRIX              :       CW18.72.0.3          IP-HOST1.log
DEC_DECSTATION      :       CW180.72.0.3         IP_HOST_AL.log
DEC_DECSTATION_ADDR :       CW180.72.0.3         IP_HOST_al2.log
FOR_VISITORS23_HOST :       HL617.253.1101.2     IP_HOST_hostinfo.log
FOR_VISITORS24_HOST :       HL617.253.1101.2     IP_HOST_hostinfo2.log
FOR_VISITORS25_HOST :       HL617.253.1101.2     IP_HOST_webform3.log
FOR_VISITORS25_HOST :       HL617.253.1101.2     IP_HOST_webform4.log
FOR_VISITORS25_HOST :       HL617.253.1201.2     IP_HOST_webform4.log

##</code><code>##

Dumping Output
DEC_DECSTATION         CW180.72.0.3           IP_HOST_AL.log
DEC_DECSTATION_ADDR    CW180.72.0.3           IP_HOST_al2.log
FOR_VISITORS23_HOST    HL617.253.1101.2       IP_HOST_hostinfo.log
FOR_VISITORS24_HOST    HL617.253.1101.2       IP_HOST_hostinfo2.log
FOR_VISITORS25_HOST    HL617.253.1101.2       IP_HOST_webform3.log
                                              IP_HOST_webform4.log
                       HL617.253.1201.2       IP_HOST_webform4.log
ULTRIX                 CW18.72.0.3            IP-HOST1.log