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Re: Perlbrew issues. Suggest a way out.

by flexvault (Monsignor)
on Nov 18, 2012 at 15:25 UTC ( #1004428=note: print w/replies, xml ) Need Help??

in reply to Perlbrew issues. Suggest a way out.


It is very easy to install multiple copies of Perl on *nix boxes. I usually have 3 to 5 versions depending on how old the computer is. Download from CPAN the version you want. I do the following system commands after verifying the checksum:

gzip -d perl-5.14.2.tar.gz tar -xf perl-5.14.2.tar # This creates a new directory + perl-5.14.2 cd perl-5.14.2 ./Configure -des -Dprefix=/usr/opt/perl_5_14_2 # directory should b +e unique and already exist make make test make install # This will install to /usr/op +t/perl_5_14_2 ln -s /usr/opt/perl_5_14_2/bin/perl /usr/local/bin/myperl

This should generate a new and totally different Perl from the system Perl. To test that everything works, just type

myperl -V # you can call it anything, but I recommend having perl + in the name

Some things to keep in mind.

  • If you need CPAN modules, they have to be installed with 'myperl'. The libraries are totally separate from the system libraries.
  • Do not change the default Perl. I usually do a symbolic link to the system perl in '/usr/local/bin/perl -> system perl. This will give an error message if I try to re-link the default perl.
  • If you want the additional features for your custom Perl, read about all the options in 'Configure'. Also the Configure options are shown in all versions of perl by doing 'perl -V;grep "config_args"' which will show you how the system Perl was built.
  • Hint: If you need or use other Perl commands, then I usually do a symbolic link to them. But remember, if you have multiple Perls, you will have to re-link the commands to get the correct version.
  • Hint2: If you have multiple cores, do the 'make' first, and then do the 'make test' as I showed here, otherwise you may test something before it's compiled.
  • Hint3: From the problems you're having, maybe re-install the operating system before doing these steps. Or try this first and if you still have problems, then re-install the system. All of my laptops have *nix and windows both with out a problem. It's easier than trying to have multiple newer *nixes on 1 box :-)

You'll never again be limited by the Perl that ships with the *nix!

I did this from memory, so if you find something that works differently, I'll check it, and update the documentation or at least mark it as system dependent.

Good Luck!

"Well done is better than well said." - Benjamin Franklin

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[davido]: Exactly: SoPW. This isn't going to be solved easily in the CB.
[james28909]: in need "yesterday" and so on, to be absolute like "1" or "31"
[stevieb]: ...and throw some of your existing code into the equation as well, just so readers know you've given a try at it ;)
[james28909]: ok
[stevieb]: davido thanks for the link ;) I was being the typical lazy
[davido]: date parsing is hard. The more examples you can provide of the input (within reason) and expected output, the better.
[stevieb]: agreed. That's why I said at least a half-dozen. If enough of the different formats are present, the date/time folk may not have to request more. If they do, then at least there was a decent base to start with
[stevieb]: I do date and time transformations in both Perl and Python, but not frequently enough to not have to search for the format params etc ;)

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