instead of processing the elements of the array one after each other, i create a list out of the elements. then a mod-3 counter puts them in the appropriate slot - that is the (IMO) cool part distinguishing the solution from the one
leriksen gave.
use strict;
use Data::Dumper;
my @array = ('nfs,7,rw',
'afp,12,rro',
'cifs,32,ro',
'dns,5,rw',
);
my @splitted_up = ();
my $cnt = 0;
push @{ $splitted_up[($cnt ++) % 3] }, $_
foreach (split (/,/, join (",",@array)));
print (Dumper \@splitted_up);
generated output is the same.
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