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Select or download this
```
$ which perl
/usr/local/bin/perl
```

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

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$ perlbrew list
  perl-5.20.3
  current (5.24.1)

Select or download this

$ which perl
/Users/ken/perl5/perlbrew/perls/perl-5.24.0t/bin/perl
...
  perl-5.25.9t
$ which perl
/usr/local/bin/perl

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

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$ perlbrew switch perl-5.20.2t
$ perlbrew list
...
/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-th
+read-multi-2level

Select or download this

$ perlbrew switch
Currently switched to perl-5.20.2t
...
/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-th
+read-multi-2level