chmod 0777 /public # OK
chmod 777 /public # WRONG! This is mode 777 decimal = 01411 octal.
-Commands that return numbers currently always print them in decimal.
+Commands that return numbers usually print them in decimal, but
+some commands print numbers in other radices (eg. C<umask> prints
+the mode in octal, preceeded by C<0>).
=head1 WILDCARDS AND GLOBBING