$ which perl
/usr/local/bin/perl

##</code><code>##

$ perlbrew switch perl-5.24.0t
$ which perl
/Users/ken/perl5/perlbrew/perls/perl-5.24.0t/bin/perl

##</code><code>##

$ perlbrew list
  perl-5.20.3
  current (5.24.1)

##</code><code>##

$ which perl
/Users/ken/perl5/perlbrew/perls/perl-5.24.0t/bin/perl
$ perlbrew off
perlbrew is turned off.
$ perlbrew list
  perl-5.14.0t
  perl-5.14.2
  perl-5.14.2t
  perl-5.18.0t
  perl-5.18.1t
  perl-5.20.0t
  perl-5.20.2t
  perl-5.22.0t
  perl-5.24.0t
  perl-5.25.9t
$ which perl
/usr/local/bin/perl

##</code><code>##

perlbrew switch 5.20.3
...
$ perlbrew list
* perl-5.20.3
  current (5.24.1)

##</code><code>##

$ perlbrew switch perl-5.20.2t
$ perlbrew list
  ...
  perl-5.20.0t
* perl-5.20.2t
  perl-5.22.0t
  ...
$ which perl
/Users/ken/perl5/perlbrew/perls/perl-5.20.2t/bin/perl
$ perl -v | head -2 | tail -1
This is perl 5, version 20, subversion 2 (v5.20.2) built for darwin-thread-multi-2level

##</code><code>##

$ perlbrew switch
Currently switched to perl-5.20.2t
$ which perl
/Users/ken/perl5/perlbrew/perls/perl-5.20.2t/bin/perl
$ /Users/ken/perl5/perlbrew/perls/perl-5.20.2t/bin/perl -v | head -2 | tail -1
This is perl 5, version 20, subversion 2 (v5.20.2) built for darwin-thread-multi-2level