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Yes. The normal/unprivileged user can write to /tmp and /var/tmp, for legitimate reasons. Also, if the user or group permissions of a given file/directory includes those of the user, he or she can write to those files or directories as well. Having said that, providing write capability to operating system files and directories to a normal user, is shooting ...


/tmp and possibly /var/tmp are writtable to any users.


In Unix, to do even the most basic stuff, a user needs access to sundry resources (executables, libraries, configuration files, manual pages, examples, ...). Even what is considered "normal commands" like cp(1), ls(1), are regular programs run by the user, who will need to be able to access them. Users need access to much of the system, that can't be cut off ...

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