It's an alias:

marto@shemp ~ $ perlbrew use 5.16.0

A sub-shell is launched with 5.16.0 as the activated perl. Run 'exit' 
+to finish it.

bash-4.2$ exit
exit
marto@shemp ~ $ perlbrew use perl-5.16.0

A sub-shell is launched with perl-5.16.0 as the activated perl. Run 'e
+xit' to finish it.

[download]

Note that use is temporary, perlbrew switch version is permanent.

In reply to Re^2: ERROR: The installation "perl-5.20.1" is unknown. by marto
in thread ERROR: The installation "perl-5.20.1" is unknown. by thanos1983

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