Re: "Installed" Perl 5.34 , sort of

You may find it's easier to use Perlbrew.

This won't mess with the system Perl. (See ++choroba's comments re that.)

$ /usr/bin/perl -v

This is perl 5, version 32, subversion 1 (v5.32.1) built for x86_64-cy
+gwin-threads-multi
(with 6 registered patches, see perl -V for more detail)

...
[download]

You can have multiple versions of Perl installed.

$ perlbrew list
 * perl-5.34.0
   perl-5.33.5
   perl-5.32.0
   perl-5.30.0
[download]

You can very easily switch between the different Perl versions you have installed.

$ which perl
/home/ken/perl5/perlbrew/perls/perl-5.34.0/bin/perl

$ perlbrew switch perl-5.32.0

$ which perl
/home/ken/perl5/perlbrew/perls/perl-5.32.0/bin/perl

$ perlbrew switch perl-5.34.0

$ which perl
/home/ken/perl5/perlbrew/perls/perl-5.34.0/bin/perl
[download]

If you start your scripts with the shebang

#!/usr/bin/env perl
[download]

they will run using the current (`which perl`) version. This can be very useful when troubleshooting why a script worked successfully under one Perl version but not another: just run the script; switch version; run the script again.

Installation of Perlbrew is straightforward; as is the installation of Perl versions. There's no need to go through the laborious effort of installing Perl by hand; there's no need to fiddle with $PATH; there's no need to change shebang lines.

I've used Perlbrew on many different platforms for many years (1 to 2 decades) and can highly recommend it. Many other monks also use Perlbrew so, if you run into difficulties, there's plenty of help available.

— Ken

Comment on Re: "Installed" Perl 5.34 , sort of Select or Download Code

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Re^2: "Installed" Perl 5.34 , sort of by ikegami (Patriarch) on May 18, 2022 at 18:02 UTC
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 ... "$PERLBREW_ROOT"/perls/5.30t/bin/perl ...` [download] Update: Clarified which shells `switch` affects.	[reply] [d/l] [select]
Re^3: "Installed" Perl 5.34 , sort of by kcott (Archbishop) on May 19, 2022 at 01:50 UTC
"... you should be using `use` (changes that shell only), ..." `use` is an option; not a requirement. Fix with: `s/should be using/can also use/` (or similar). "... not `switch` (changes all shells)." That's incorrect. Fix with: `s/changes all shells/changes subsequent shells/` (or similar). Below, I show starting two shells both using 5.34 — I change to 5.32 in the second shell; the first shell remains at 5.34; after that I start a third shell which uses 5.32. `$ # Shell A $ perlbrew list * perl-5.34.0 perl-5.33.5 perl-5.32.0 perl-5.30.0 $ # perlbrew switch in Shell B $ perlbrew list * perl-5.34.0 perl-5.33.5 perl-5.32.0 perl-5.30.0` [download] `$ # Shell B $ perlbrew list * perl-5.34.0 perl-5.33.5 perl-5.32.0 perl-5.30.0 $ perlbrew switch perl-5.32.0 $ perlbrew list perl-5.34.0 perl-5.33.5 * perl-5.32.0 perl-5.30.0` [download] `$ # Shell C $ perlbrew list perl-5.34.0 perl-5.33.5 * perl-5.32.0 perl-5.30.0` [download] — Ken	[reply] [d/l] [select]
Re^4: "Installed" Perl 5.34 , sort of by ikegami (Patriarch) on May 19, 2022 at 13:29 UTC
use is an option; not a requirement. Well yeah. And I was saying it's the one that should have been used here. Fix with: s/changes all shells/changes subsequent shells/ (or similar) Yeah, since .bashrc is only executed on startup. I'll clarify.	[reply]
Re^2: "Installed" Perl 5.34 , sort of by misterperl (Pilgrim) on May 18, 2022 at 17:15 UTC
TYVM, I looked at this also. First I unset PERL* env VARS, and I CD'ed to /opt/local. I removed ALL perl copies with yum. My @INC looks a lot better (no more /root...), BUT, I have some strange double-/ such as: `/opt/local/perl5//lib/site_perl/5/34/1` Seems like its very difficult to get a clean @INC ! TY	[reply] [d/l]
Re^3: "Installed" Perl 5.34 , sort of by kcott (Archbishop) on May 19, 2022 at 02:22 UTC
I don't have `//` in any of my `@INC` paths: `$ perl -E 'say for @INC' /home/ken/perl5/perlbrew/perls/perl-5.34.0/lib/site_perl/5.34.0/cygwin +-thread-multi /home/ken/perl5/perlbrew/perls/perl-5.34.0/lib/site_perl/5.34.0 /home/ken/perl5/perlbrew/perls/perl-5.34.0/lib/5.34.0/cygwin-thread-mu +lti /home/ken/perl5/perlbrew/perls/perl-5.34.0/lib/5.34.0` [download] I suspect you may have done something in your installation which caused this; however, without knowing the steps you took, I don't know what that might have been. Do note the differences between your `/opt/local/perl5//lib/site_perl/5/34/1` and my `/home/ken/perl5/perlbrew/perls/perl-5.34.0/lib/site_perl/5.34.0`: At the start: you have `/opt/local`; I have `/home/ken`. In the middle: you have `//`; I have `/perlbrew/perls/perl-5.34.0/`. At the end: you have `/5/34/1`; I have `/5.34.0`. There are potentially a number of things you may need to change. Having `//` in a path is not a problem in itself: `x/y` and `x//y` are effectively the same. `$ ls -al x/y ls: cannot access 'x/y': No such file or directory $ mkdir -p x/y $ cd x//y $ pwd /home/ken/tmp/x/y $ cd ../.. $ pwd /home/ken/tmp $ cd x/y $ pwd /home/ken/tmp/x/y $ cd ../.. $ pwd /home/ken/tmp` [download] — Ken	[reply] [d/l] [select]
Re^4: "Installed" Perl 5.34 , sort of by misterperl (Pilgrim) on May 20, 2022 at 13:35 UTC
Let me ask another way... My @INC seems screwy. I do configure and make and make test and make install- how early in that process can I see @INC, and how can I view it? TYVM and happy Friday to all Monks!	[reply]
Re^5: "Installed" Perl 5.34 , sort of by kcott (Archbishop) on May 21, 2022 at 04:53 UTC
Re^4: "Installed" Perl 5.34 , sort of by misterperl (Pilgrim) on May 20, 2022 at 14:59 UTC
TYVM sir your comparison is helpful. I'm investigating whats in /etc/profile.d I suspect there are some paths in there messing things up. As far as the //, likely there is an ENV path somewhere ending in /, and the make somewhere , blindly added /more_dirs, I suspect. I rebuilt everything today as root (for make install) with no errors, I got the OK at each step. Then I use CPAN to add some modules, but oddly, now I'm having to go in and chmod a bunch of the pm's because the privs are wrong- like dozens, maybe hundreds: `[root@newnode Socket]# ls -l total 20 -r--r--r-- 1 root root 12778 Nov 2 2021 INET.pm -r--r--r-- 1 root root 3971 Nov 2 2021 UNIX.pm [root@newnode Socket]# chmod 755 *pm` [download] I've been building perl since like 1995 and NEVER had these issues. I just performed the cpan instructions of configure, make, make test and make install, nothing special, on a Rocky Linux box. I guess maybe the Rocky part is somehow messing things up?	[reply] [d/l]
Re^5: "Installed" Perl 5.34 , sort of by hippo (Bishop) on May 20, 2022 at 15:16 UTC
Re^5: "Installed" Perl 5.34 , sort of by kcott (Archbishop) on May 21, 2022 at 05:16 UTC


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