$ perl -v | head -2 | tail -1
This is perl 5, version 26, subversion 0 (v5.26.0) built for darwin-thread-multi-2level
$ /usr/bin/perl -v | head -2 | tail -1
This is perl 5, version 18, subversion 2 (v5.18.2) built for darwin-thread-multi-2level