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$ perl -v This is perl 5, version 18, subversion 1 (v5.18.1) built for darwin-th +read-multi-2level ...
$ /usr/bin/perl -v This is perl 5, version 12, subversion 3 (v5.12.3) built for darwin-th +read-multi-2level (with 2 registered patches, see perl -V for more detail) ...
#!/usr/bin/env perl
#!/usr/bin/env perl -l