howa wrote:
>
> Why sometimes I can use a command to install Perl module, e.g.
>
> perl -MCPAN -e "install Digest::MD5"
>
> But sometimes can't?
>
> e.g.
>
> perl -MCPAN -e "install Archive::Zip"
>>> Can't locate object method "install" via package "Archive::Zip" at -e line
>>> 1.
>
>
> Are there any reason?
This is something I haven't noticed before:
> perl -MCPAN -MO=Deparse -e "install Digest::MD5"
install('Digest::MD5');
-e syntax OK
> perl -MCPAN -MO=Deparse -e "install Archive::Zip"
'Archive::Zip'->install;
-e syntax OK
The problem is that the CPAN module loads Archive::Zip itself, so that Perl then
recognizes the module name as a class instead of a simple bareword.
The easiest fix is to force the semantics by using parentheses:
> perl -MCPAN -MO=Deparse -e "install(Digest::MD5)"
and
> perl -MCPAN -MO=Deparse -e "install(Archive::Zip)"
both of which will work fine.
HTH,
Rob
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