Linux Nobody User?
The opposite of the root user, who has
all the power to perform system administration actions, is
the nobody user
. The nobody user has the
least privileges in Linux. It uses the user UID 99 as a
common value in Redhat. The nobody user, by default, belongs
to the nobody group, also commonly set to group
GID 99. As system administrator, the
nobody user should be kept with only minimal privileges.
User nobody does not own files, is a
member of a non-privileged group and has no specific
abilities. The user is commonly used by daemon programs as
they send signals to each other and perform
ptrace and strace
(Linux debugging system calls), so it can read and write to
the memory of other processes. Linux standard base
recommends that a specific account is created for each
daemon process. Doing so makes the security monitoring much
easier. Caveat: By default, Oracle uses the nobody user and
nobody group to perform external jobs. This, however, is
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