topic Re: Perl on VMS in Operating System - OpenVMS

Perl on VMS

Robert Atkinson — Fri, 31 Oct 2003 09:22:54 GMT

I am just starting to learn Perl using 'Perl For Dummies', but this assumes a Unix environment quite a bit.

Does anyone have any helpful tips on using Perl on VMS (Apache), particularly the command differences for functions?

Are there any good VMS Perl references on the Web that I should look at?

Thanks in advance, Rob.

Re: Perl on VMS

Craig A Berry — Fri, 31 Oct 2003 09:48:57 GMT

Start with

$ perldoc perlvms

or go to

http://www.perldoc.com/perl5.8.0/pod/perlvms.html

Check out the (slightly out of date) page at:

http://www.sidhe.org/vmsperl

Send mail to vmsperl-subscribe@perl.org to join the vmsperl mailing list, and/or check out the list archives at:

http://www.xray.mpe.mpg.de/mailing-lists/vmsperl/

But depending on what you're doing there may not be that many differences from UNIX versions of Perl.

Re: Perl on VMS

Robert Atkinson — Fri, 31 Oct 2003 10:09:07 GMT

Craig, thanks for the response.

I wondering about file-open modes. All of the documentation I've read (limited so far) doesn't seem say anything about opening files in shared mode or private mode.

Also, I can't see anything about indexed files and index/key reads.

Am I jumping ahead of myself (Chapter 4) or is this something Perl can't handle?

Cheers, Rob.

Re: Perl on VMS

Willem Grooters — Fri, 31 Oct 2003 10:14:17 GMT

I just started as well - just trying to build 5.8.1 ('latest.tgz') and ran into some problems (Craig, you have noticed that - I'll comne to that in the mailing list, so Robert, indeed subscribe - helps a lot) but these can be solved, no doubt.

FYI: These have nothing to do with VMS/UNIX problems. It's a VERY smooth (though timely) build. I wish that this would apply to all OpenSource software ;-)

BTW - it seems 5.8.2 is out as well but I'm not certain that's for VMS as well.

(Off topic, but still: on perl.org, you get 'stable.tgz', via the vmsperl site, you get 'latest.tgz'. What's the difference?)

Re: Perl on VMS

Craig A Berry — Fri, 31 Oct 2003 10:53:33 GMT

Robert,

File open modes can be handled much the same way they are in the extensions to creat(), fopen(), etc. avalable in C. Look at the docs to creat() in the CRTL manual. Then, for the corresponding access in Perl, look at:

$ perldoc VMS::Stdio

The VMS::Stdio extension is included in the core build.

For working with RMS indexed files, you'll need the add-on extension named, appropriately enough,
VMS::IndexedFile. See

http://search.cpan.org/~bhughes/VMS-IndexedFile-0_02/

Willem, the difference between "latest" and "stable" depends on where things are in the development cycle. Often they are the same, but when a new version is released, it is given the "latest" designation and then also considered "stable" if nothing too ugly turns up after the release.

Re: Perl on VMS

Robert Atkinson — Fri, 31 Oct 2003 11:16:13 GMT

Ahhhhhh! Found this is VMS::STDIO

shr=STRING
File sharing options. Choose one of the following:

del
Allows users to delete.

get
Allows users to read.

mse
Allows mainstream access.

nil
Prohibits file sharing.

put
Allows users to write.

upd
Allows users to update.

upi
Allows one or more writers.

Just what I was looking for!!

Cheers, Craig.

Re: Perl on VMS

Martin P.J. Zinser — Sat, 01 Nov 2003 19:33:45 GMT

Hello,

an example how to use VMS::Indexedfile (and a number of other modules ;-) can be found at

http://zinser.no-ip.info/vms/sw/notes/perl_mod.pl

Greetings, Martin

Re: Perl on VMS

labadie_1 — Mon, 03 Nov 2003 16:24:20 GMT

Perl is a great, powerful langage, but I do not like it a lot, because it is a nightmare to maintain.

You should have a look at Python for Vms
available at
vmspython.dyndns.org
or at the mirrors.

Regards

Gerard

Re: Perl on VMS

Martin P.J. Zinser — Mon, 03 Nov 2003 17:02:29 GMT

Hello Gerard,

without starting a flame war ;-), as we used to say back in the days when I still was in Physics: You can write Fortran programs in any programming language ;-)
In this context here, you can write programs that are easy to maintain in Perl, Python, Cobol or DCL. You can also write programs that are next to impossible to maintain in any of these languages. It really depends more on the programmer and the culture in your organization than on the language you use. Having said that, I do admit that the obfuscated Perl contest certainly is much more fun than an obfuscated Cobol contest would be (although there are people out there who would claim Cobol to be obfuscated by design ;-)

Greetings, Martin

Re: Perl on VMS

Ian Miller. — Tue, 04 Nov 2003 04:07:56 GMT

and if you can't write it in FORTRAN then write it in assembler and if you can't write it in assembler it can't be done :-)

Personally I would use different languages for different types of jobs.

Re: Perl on VMS

labadie_1 — Tue, 04 Nov 2003 06:00:00 GMT

Hello

See an example of accessing an indexed file with Python at

http://vmspython.dyndns.org/docs/python_vms/reference_manual_003.html#example_7-1

I find it quite easy to read and maintain.

I agree with you, Martin.

regards

Gerard