G'day Aldebaran,

"... I do not know the perl command to update itself."

Having been advised against using the system Perl on Mac, you wouldn't be doing this even if Perl had such a command. Correct?

I used Perlbrew on Mac for about nine years and never had any problems. I changed to Cygwin on Win10 about five years ago; still using Perlbrew and still having no problems.

Following links from Perlbrew, you'll eventually get to CPAN: perlbrew. Here you'll find documentation for perlbrew commands; in the context of the current discussion, the most pertinent are probably install, upgrade-perl, and install-cpanm.

Once you have Perlbrew installed, you can easily switch between whatever versions of Perl you have; e.g. 

$ perl -v | head -2 | tail -1
This is perl 5, version 36, subversion 0 (v5.36.0) built for cygwin-th
+read-multi

$ perlbrew switch perl-5.32.0

$ perl -v | head -2 | tail -1
This is perl 5, version 32, subversion 0 (v5.32.0) built for cygwin-th
+read-multi

$ perlbrew switch perl-5.36.0

$ perl -v | head -2 | tail -1
This is perl 5, version 36, subversion 0 (v5.36.0) built for cygwin-th
+read-multi

[download]

I recommend using the following shebang in your scripts. 

#!/usr/bin/env perl

[download]

This means that the script will use whatever Perl version is current. 

$ cat test_shebang.pl
#!/usr/bin/env perl

print $^V;

$ ./test_shebang.pl
v5.36.0

$ perlbrew switch perl-5.33.5

$ perl -v | head -2 | tail -1
This is perl 5, version 33, subversion 5 (v5.33.5) built for cygwin-th
+read-multi

$ ./test_shebang.pl
v5.33.5

[download]

— Ken

In reply to Re^3: Establishing a beachhead and acquiring privileges on a Mac-mini by kcott
in thread Establishing a beachhead and acquiring privileges on a Mac-mini by Aldebaran

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