just run the script; switch version; run the script again.

First of all, you should be using use (changes that shell only), not switch (changes all subsequently-created shells).

But you don't even need to use use. 

"$PERLBREW_ROOT"/perls/5.34t/bin/perl ...
"$PERLBREW_ROOT"/perls/5.32t/bin/perl ...
"$PERLBREW_ROOT"/perls/5.30t/bin/perl ...

[download]

Update: Clarified which shells switch affects.

In reply to Re^2: "Installed" Perl 5.34 , sort of by ikegami
in thread "Installed" Perl 5.34 , sort of by misterperl

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