And finally, as I already alluded to, how does CPAN handle the fact that multiple users might be running the same Perl installation? Sorry if that's a separate question but it seems probably related. PL or Build. Same goes for cpanm and cpanp. These installation scripts mostly use ExtUtils::MakeMaker or Module::Build to install the distribution though other installers exist. Those are the defaults use by the installers [1].
However, the two most commonly used installers allow the user doing to installation to override any and all of these. If a module is installed in a non-standard location,. CPAN doesn't actually install files. It runs the install script embedded in each distribution, which then performs the actual install. The short version is that perl has multiple "system directories", one of which is for "site specific" modules and thus used as the default installation target.
What people do instead is to configure ExtUtils::MakeMaker, Module::Build, etc to install into a user's home directory. This can be done with environment variables.
Then they tell perl to add this directory to INC , so modules can actually be found and loaded. All of the above is automated and encapsulated in local::lib. As of CPAN 1. This is very easy with e.
This is a complex question. You can tell where core libraries are located by seeking the place of one of them:. Will tell you where the B core module is located. Connect and share knowledge within a single location that is structured and easy to search. I constantly have to set up new servers for an employer of mine for an exact purpose of his, and as such they all have to be set up in exactly the same way.
So I've created a script in PHP that I run from my own box to automatically send over all the relevant files, compile everything, run updates, and everything else. However, for some reason these brand new servers come with perl, which is fine, but they have perl installed in different locations. This makes it a pain for me to copy over Config. You're doing it wrong and making more work for yourself. Investigate configuration management tools Puppet , Chef or deployment tools radmind -- If you deploy your systems with something like the tools I just mentioned you will know that every box is truly identical , and more importantly that they'll be kept that way.
Until you have the time to do that, locate or find as others have mentioned will at least tell you where the file you want lives. The path here is all the directories of your perl installation where perl is allowed to look for modules to load. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
Currently all programs that are dealing with version use something like this. PL or Build. PL well, we try to handle a bit more, but with little enthusiasm. Debugging this module is more than a bit complex due to interference from the software producing the indices on CPAN, the mirroring process on CPAN, packaging, configuration, synchronicity, and even gasp!
For debugging the code of CPAN. Note that o debug 0 turns debugging off. What seems a successful strategy is the combination of reload cpan and the debugging switches.
Add a new debug statement while running in the shell and then issue a reload cpan and see the new debugging messages immediately without losing the current context. If you maintain machines that are not networked at all, you should consider working with file: URLs. You'll have to collect your modules somewhere first.
So you might use CPAN. This floppy is kind of a personal CPAN. Returns true if the module is installed. Used to load all modules into the running CPAN. For example, the following command will prevent YAML. Returns true if the module is installed and in a usable state. Only useful for a handful of modules that are used internally. See the source for details.
The constructor for all the singletons used to represent modules, distributions, authors, and bundles. If the object already exists, this method returns the object; otherwise, it calls the constructor. There's no strong security layer in CPAN. We compare to a checksum that comes from the net just as the distribution file itself.
But we try to make it easy to add security on demand:. Since release 1. The CPAN modules can be signed by their authors, thus giving more security. You will need to have Module::Signature installed, which in turn requires that you have at least one of Crypt::OpenPGP module or the command-line gpg tool installed. You will also need to be able to connect over the Internet to the public key servers, like pgp.
Most functions in package CPAN are exported by default. The reason for this is that the primary use is intended for the cpan shell or for one-liners. When running perl Makefile. PL that is being executed. This prevents runaway processes with newer versions of Module::Install. The same effect can be achieved by starting the cpan shell with this environment variable set.
For Net::FTP alone, one can also always set passive mode by running libnetcfg. Populating a freshly installed perl with one's favorite modules is pretty easy if you maintain a private bundle definition file.
To get a useful blueprint of a bundle definition file, the command autobundle can be used on the CPAN shell command line. This command writes a bundle definition file for all modules installed for the current perl interpreter. With a clever bundle file you can then simply say. Maintaining a bundle definition file means keeping track of two things: dependencies and interactivity.
On the other hand, it's annoying that so many distributions need some interactive configuring. So what you can try to accomplish in your private bundle file is to have the packages that need to be configured early in the file and the gentle ones later, so you can go out for coffee after a few minutes and leave CPAN.
Thanks to Graham Barr for contributing the following paragraphs about the interaction between perl, and various firewall configurations. For further information on firewalls, it is recommended to consult the documentation that comes with the ncftp program. If you are unable to go through the firewall with a simple Perl setup, it is likely that you can configure ncftp so that it works through your firewall.
This is when the firewall machine runs a web server, and to access the outside world, you must do so via that web server. This where the firewall machine runs an ftp server. This kind of firewall will only let you access ftp servers outside the firewall. This is usually done by connecting to the firewall with ftp, then entering a username like "user outside. One-way visibility means these firewalls try to make themselves invisible to users inside the firewall.
An FTP data connection is normally created by sending your IP address to the remote server and then listening for the return connection.
But the remote server will not be able to connect to you because of the firewall. For these types of firewall, FTP connections need to be done in a passive mode. This is what is normally called a 'socksified' perl. With this executable you will be able to connect to servers outside the firewall as if it were not there. This is when the firewall implemented in the kernel via NAT, or networking address translation , it allows you to hide a complete network behind one IP address.
With this firewall no special compiling is needed as you can access hosts directly. Probably you do have the old version installed. This can happen if a module installs itself into a different directory in the INC path than it was previously installed.
This is not really a CPAN. Because there are people who have their precise expectations about who may install where in the INC path and who uses which INC array. I want to clean up my mess, and install a new perl along with all modules I have. How do I go about it? Run the autobundle command for your old perl and optionally rename the resulting bundle file e.
When I install bundles or multiple modules with one command there is too much output to keep track of. As of CPAN 1. Another thing you should bear in mind is that the UNINST parameter can be dangerous when you are installing into a private area because you might accidentally remove modules that other people depend on that are not using the private area.
I installed a Bundle and had a couple of fails. When I retried, everything resolved nicely. Can this be fixed to work on first try? The reason for this is that CPAN does not know the dependencies of all modules when it starts out.
To decide about the additional items to install, it just uses data found in the META. An undetected missing piece breaks the process. But it may well be that your Bundle installs some prerequisite later than some depending item and thus your second try is able to resolve everything.
Please note, CPAN. For bundles which fail and you need to install often, it is recommended to sort the Bundle definition file manually. In our intranet, we have many modules for internal use.
These are readline issues and can only be fixed by studying readline configuration on your architecture and adjusting the referenced file accordingly. Quite often harmless changes like uppercasing or lowercasing some arguments solves the problem. Internally CPAN. One way of doing so would be. If other charset support is needed, please file a bug report against CPAN. Maybe we can extend the support or maybe UTF-8 terminals become widely available.
Note: this config variable is deprecated and will be removed in a future version of CPAN. By default, CPAN will install the latest non-developer release of a module. If you want to install a dev release, you have to specify the partial path starting with the author id to the tarball you wish to install, like so:.
How do I install a module and all its dependencies from the commandline, without being prompted for anything, despite my CPAN configuration or lack thereof? How do I create a Module::Build based Build. I'm frequently irritated with the CPAN shell's inability to help me select a good mirror.
CPAN can now help you select a "good" mirror, based on which ones have the lowest 'ping' round-trip times. From the shell, use the command 'o conf init urllist' and allow CPAN to automatically select mirrors for you. Beyond that help, the urllist config parameter is yours. You can add and remove sites at will.
You should find out which sites have the best up-to-dateness, bandwidth, reliability, etc. Some people prefer fast downloads, others up-to-dateness, others reliability. How are we doing? Please help us improve Stack Overflow. Take our short survey. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more.
Ask Question. Asked 12 years, 11 months ago. Active 3 years, 10 months ago. Viewed k times. How can I install a module into some other directory and use it? Ram Ram 2, 10 10 gold badges 36 36 silver badges 44 44 bronze badges.
In general, you should provide the error message. PL instead of Makefile.
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