$ which perl
/usr/bin/perl
$ perl -v
This is perl, v5.8.8 built for x86_64-linux-thread-multi
$ perl -V | tail -8
  Compiled at Nov  6 2008 13:11:21
  @INC:
    /lib/5.8.8/x86_64-linux-thread-multi
    /lib/5.8.8
    /lib/site_perl/5.8.8/x86_64-linux-thread-multi
    /lib/site_perl/5.8.8
    /lib/site_perl
    .
$