Nobody
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In many Unix variants, "nobody" is the conventional name of
a user account which owns no files, is in no privileged groups, and has
no abilities over and above those which every user has. It is common to
run daemons as nobody, especially servers, in order to limit the damage
that could be done by a malicious user who gained control of it.
However, the usefulness of this technique is reduced if more than one
daemon is run like this, because then gaining control of one daemon
would provide control of them all. The reason is that nobody processes
have the ability to send signals to each other and even (on Linux)
ptrace each other. Creating one account for each daemon provides for a
tighter security policy, and is specified by the Linux Standard Base.
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