Hi Feng,

On Fri, 22 Jul 2011 16:47:09 +0800
Feng He <short...@gmail.com> wrote:

> What's the meaning of Perl's "-M" operator?
> which perldoc document is it get descripted in?
> 

If you mean the -M operator inside Perl code see:

http://perldoc.perl.org/functions/-X.html

(Accessible as "perldoc -f -X" - "-f" for function.).

If you mean the command-line flag, see:

http://perldoc.perl.org/perlrun.html

("perldoc perlrun").

Hope it helps.

Regards,

        Shlomi Fish

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