Checking and installing a perl module

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

Replies are listed 'Best First'.
Re: Checking and installing a perl module by afoken (Chancellor) on Jun 11, 2009 at 12:00 UTC
It already exists and is named cpan. Alexander -- Today I will gladly share my knowledge and experience, for there are no sweeter words than "I told you so". ;-)	[reply]
Re^2: Checking and installing a perl module by Anonymous Monk on Jun 11, 2009 at 12:06 UTC
BEGIN { eval('use abc::fdj'); if($@) { die "You need to install ModuleName...\n" if $@; #`perl -MCPAN -e shell \| install abc::def`; # `install abc::def`; } else { print "The module is installed\n"; } } [download] This will check whether a module is installed....But how to install it from the script if it is not installed??	[reply] [d/l]
Re^3: Checking and installing a perl module by ikegami (Patriarch) on Jun 11, 2009 at 13:36 UTC
`my $module = 'My::Module'; system(cpan => $module) and die("system cpan failed: $!/$?\n");` [download]	[reply] [d/l]
Re: Checking and installing a perl module by linuxer (Curate) on Jun 11, 2009 at 12:05 UTC
You could eval a use of the desired module and check `$@` afterwards. How do you want to install the module? With CPAN? With system's package system? I'd prefer that the script aborts with an information for the user, if the module is not installed. Let the user handle the installation of modules. Best of all, this already happens when using a not installed module. Don't mess up the system installation ... How do you know the user's preferences where to install which modules?	[reply] [d/l]
Re^2: Checking and installing a perl module by Anonymous Monk on Jun 11, 2009 at 12:09 UTC
No I will check for only one Module....I will run my script in different machines....If the module is not installed, then the script should install it.....	[reply]
Re^3: Checking and installing a perl module by Bloodnok (Vicar) on Jun 11, 2009 at 17:31 UTC
Are there underlying (and self-evidently, unstated) reason(s) why you don't use NFS mounted extra libraries ?? In that way, you remove the need to maintain libraries across a load of disparate machines (and installations) with all the attendant problems - at least one of which, you've now encountered. A user level that continues to overstate my experience :-))	[reply]
Re^4: Checking and installing a perl module by vek (Prior) on Jun 11, 2009 at 22:03 UTC
Re^5: Checking and installing a perl module by Bloodnok (Vicar) on Jun 12, 2009 at 10:04 UTC
Re: Checking and installing a perl module by mhearse (Chaplain) on Jun 11, 2009 at 23:34 UTC
And another way. Where mod_list contains a list of modules to check for. `#!/bin/bash export FTP_PASSIVE=1 cat mod_list \| while read module do perl -M$module -e exit 2> /dev/null \|\| { echo "Missing $module" perl -MCPAN -e "install $module" } done` [download]	[reply] [d/l]