G'day thanos1983,

I do not know if this is also relevant:

$ which perl
/usr/local/bin/perl
[download]

That's probably very relevant. It looks like the system Perl. Here's what I get:

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

In "Re^2: ERROR: The installation "perl-5.20.1" is unknown.", you posted:

My list is:

$ perlbrew list
  perl-5.20.3
  current (5.24.1)
[download]

Note that none of the versions listed are preceded by an asterisk. This means that perlbrew is disabled and the system Perl has been enabled. You potentially used either the off or switch-off commands, see perlbrew for full details.

I can reproduce this:

$ 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
[download]

Then, in "Re^2: ERROR: The installation "perl-5.20.1" is unknown.", you posted:

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

Now you'll see that the selected Perl has an asterisk.

Again, I can reproduce this:

$ 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-th
+read-multi-2level
[download]

The name perl-5.20.3 has no direct bearing on the actual Perl version! While it intuitively makes sense to associate that name with Perl version 5.20.3, you don't have to. You could've called it fred or perl-99.99.99. When I install a new version, I use the '--as' switch to set the name. Once installed, you can use the alias command to create a new name. The perlbrew doco has details of these. To be absolutely certain which Perl version you're using, I suggest using an absolute path, something like this:

$ 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-th
+read-multi-2level
[download]

As for "current (5.24.1)" in your list, I probably can't help much. With an older version of App::perlbrew, "perlbrew list" used to give me every Perl on my system; I think there were an additional three, and each maybe had a format similar to "current (5.24.1)". This was all some time ago: I wouldn't put money on me recalling this accurately. Now I only get the Perls installed by perlbrew. I'm currently using "App::perlbrew 0.73"; perhaps consider upgrading if you're using an earlier version.

$ which perl
/usr/local/bin/perl
[download]

That's probably very relevant. It looks like the system Perl.

No, it doesn't. System perl is usually in /usr/bin, /usr/local/bin is reserved for locally administrated stuff outside the distribution. See also https://en.wikipedia.org/wiki/Filesystem_Hierarchy_Standard.

But then again, as several scripts start with #!/usr/local/bin/perl, it is quite common to have a symlink /usr/local/bin/perl pointing to some perl, e.g. /usr/bin/perl.

Alexander

--
Today I will gladly share my knowledge and experience, for there are no sweeter words than "I told you so". ;-)

According to https://srcc.stanford.edu/farmshare2/software-perlbrew this is a perlbrew message from a perlbrew use perl-5.20.1 command. Could you have commands like that in some .rc file?

i dont perlbrew, but it seems the command should be perlbrew use 5.20.1 anyway.

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.

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

Hello again marto,

I just switched to perl 5.20.3 with:

perlbrew switch 5.20.3
[download]

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

$ perlbrew list
* perl-5.20.3
  current (5.24.1)
[download]

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!

Hello marto,

My list is:

$ perlbrew list
  perl-5.20.3
  current (5.24.1)
[download]

Seeking for Perl wisdom...on the process of learning...not there...yet!