>>     The filesystem "security" usually lets you write anything in your
>> user space.  Meaning it won't protect you from screwing up any user file
>> unless you manually change its write permission through 'chmod'.
>
> Ok, thanks for these explanations. Since I'm a single user

	Well in fact my explanation attempt was a bit unclear and apparently
somewhat confusing, as guessed from your "Since I'm a single user" statement.
Please read again:

http://www.povray.org/documentation/view/3.6.1/794/

which better explains what I meant by "it won't protect you from screwing up
any [...] file" in your user space -- note the correction I make here  :-)

	- NC

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