There are several examples given in the documentation for sort. The trick is specifying which fields of $a and $b to compare:
my @output;
while (<INPUT_FILE>)
{
push @output, [ split(',', $_, 4) ];
}
my @sorted = sort {
$a->[0] cmp $b->[0]
||
$a->[3] <=> $b->[3]
} @output;
I took the liberty of fixing the name of @outputRef (which is not a reference) and pushing each row as an anonymous array. I also use numeric comparisons on the phone numbers.
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