in reply to ERROR: The installation "perl-5.20.1" is unknown.

What relevant lines do you have in your .rc file? What does perlbrew list show?

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Re^2: ERROR: The installation "perl-5.20.1" is unknown.
by thanos1983 (Parson) on Apr 12, 2017 at 15:15 UTC

    Hello again marto,

    I just switched to perl 5.20.3 with:

    perlbrew switch 5.20.3

    Now the error is not there anymore, but when I apply:

    $ perlbrew list * perl-5.20.3 current (5.24.1)

    Does this makes sense? I mean since I am using 5.20.3 how is it possible to have current (5.24.1)?

    Update: I am even more confused, perl -v gives me 5.24.1. I am suppose to use 5.20.3 I would expect this version to be returned.

    Seeking for Perl wisdom...on the process of learning...not there...yet!
Re^2: ERROR: The installation "perl-5.20.1" is unknown.
by thanos1983 (Parson) on Apr 12, 2017 at 15:09 UTC

    Hello marto,

    My list is:

    $ perlbrew list perl-5.20.3 current (5.24.1)
    Seeking for Perl wisdom...on the process of learning...not there...yet!