[Zope] os.system in external method

[Andy Gimblett]

> Maybe that's just me, but I found that chmod was not only 000 -> 777, 
> there is a forth number which does exactly that with permissions.

Sounds to me like you've set the "setuid" bit. Here's a page which
explains a bit more, and includes some warnings:

http://www.slug.org.au/secureFEST/unixtut/unixfs-9.html

> But then what is the difference between chmod 4xxx and sudo ?

The main advantage of sudo is the tight control (and logging) it
gives you over who has privileged access to what. It also lets to
administer it centrally, with user groups, etc. It's possibly
excessive for what you want to do but it's worth knowing about.

-Andy

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