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Mess with files that you are not allowed to touch


It never occurs to me that I am able to mess with
files that I'm not allowed
to touch, but watch this:

$ echo good > safe

$ chmod a-w safe

$ cat safe

$ ln safe unsafe

$ chmod a+w unsafe

$ echo bad > unsafe

$ cat safe

I.e., I am able to change the content of the file that
is read only to me.

So, I am start to wondering, what mechanism will
prevent me from doing
something more bad to this, e.g., change system files
that I'm not allowed
to touch?


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