ikegami,

In the title of the node I have mentioned that I am running the above in windows. hope, you would have seen that. I did not get any message after executing that. It returns the prompt silently.

C:\\Perl>perl -MCPAN -e 'shell' install Blah::Blah
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Is that a valid perl module ?
Update: I am not able to use the module also
"Keep pouring your ideas"

Your OS may be Windows, but Perl and its modules are strongly inspired by unix and the unix way of doing things.

And sorry, I didn't realize you Blah::Blah::Blah was used literally.

C:\\Perl>perl -MCPAN -e 'shell' install Blah::Blah

After running that command what happens when you run the following?

perl -MBlah::Blah -e 'exit'
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If you get a message like "Can't locate Blah/Blah.pm in @INC ..." then Blah::Blah was not installed. If you get no output at all then it is installed.

You are running windows. ikegami did mention unix. Probably because he is using unix. I am using unix and have not run the command I gave you on windows because I don't have a windows machine to try it on.

It is convention in unix that no output means everything worked. That convention carries over to programs that run on other OSes but were developed by people used to the convention.

Supposedly this convention dates to back before CRTs and LCDs were commonly used as ouput devices on computers. Back then everything that output was printed on paper. It costs more to print "success" than to not print anything so it made economic sense to only print something when there was an error.

C:\>perl -MO=Deparse -MCPAN -e 'shell'
use CPAN;
'???';
-e syntax OK

C:\>perl -MO=Deparse -MCPAN -e shell
use CPAN;
shell();
-e syntax OK

C:\>perl -MO=Deparse -MCPAN -e "shell"
use CPAN;
shell();
-e syntax OK

C:\>
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C:\>perl -MCPAN -e "shell install File::Which"
CPAN: Storable loaded ok
Going to read C:\Perl\cpan\Metadata
  Database was generated on Wed, 20 Sep 2006 09:40:02 GMT
File::Which is up to date.

cpan shell -- CPAN exploration and modules installation (v1.7602)
ReadLine support enabled

cpan> quit
Lockfile removed.

C:\>
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Anytime I've installed modules on a Win32 system (not using PPM), I've done the following:

perl -MCPAN -e"install Blah::Blah"
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perl -MCPAN -eshell
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Installing via CPAN on a Win32 system works great if you're using Strawberry Perl. You can get a copy from http://vanillaperl.com/. You can also read about it at the win32.perl.org wiki.