Didier Caamano wrote: > How can I block a user to his home directory? so he can have access to his > home directory but no other directory on the system.
A typical user account won't have write access to anything outside its home directory, unless you have world-writeable directories somewhere. So you don't really have to worry about an ordinary user changing your system behind your back. You could set up a chroot jail in a user's home directory. Then the user won't even be able to see files outside of the jail. You can read about how to set up chroot jails here: http://tjw.org/chroot-login-HOWTO/ Craig
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