Although the other answers appear to explain the way
this works
they ignore one other trick going on here.
The ASCII characters between
0 and
> inclusive
are
0 1 2 3 4 5 6 7 8 9 : ; < = and
>.
You'll notice that the
> character
was used in the example code, and not the
= charactor, though if you do
a one-to-one mapping it looks like
= should
have been used, and
> would be left over.
The reason the could given still works is another bit of
magic -- when tr's replacement list is shorter then its
source list it duplicates the last item of the replacement
list to match, thus the
Y at the end
correspondes to both
= and
>.
Except with some
/something options: see
perlop for more information, of course.
