Actually, in this case the space is being added, not by the output field separator ($,), but by the list separator ($"), because the array slice is stringified. To get what you want, you can either (1) set $" to the empty string (not undef, that gives a warning), or (2) not stringify the array slice in the print statement:
16:14 >perl -wE "my @array = qw(abc def ghi jkl mno); print @array[2,4
+], qq{\n};"
ghimno
16:14 >
See the entries for $" and $, in perlvar.
Hope that helps,
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