$ perl -v

This is perl 5, version 18, subversion 0 (v5.18.0) built for darwin-thread-multi-2level

$ uname -a
Darwin ganymede 11.4.2 Darwin Kernel Version 11.4.2: Thu Aug 23 16:25:48 PDT 2012; root:xnu-1699.32.7~1/RELEASE_X86_64 x86_64