06-18-2013
But as said preciously some daemons only run as root for they need high privileges to work correctly: ntpd can change system time, who else except root can do that?
Doing an su as root to an account is enough to launch anything with the new user's ID since after su you have now a new shell with that user's ID... till you exit...
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LEARN ABOUT DEBIAN
setuidgid
setuidgid(8) System Manager's Manual setuidgid(8)
NAME
setuidgid - runs another program under a specified account's uid and gid.
SYNOPSIS
setuidgid account child
DESCRIPTION
account is a single argument. child consists of one or more arguments.
setuidgid sets its uid and gid to account's uid and gid, removing all supplementary groups. It then runs child.
setuidgid cannot be run by anyone other than root.
EXIT CODES
setuidgid exits 111 if it cannot find a UNIX account named account, if it cannot setgid, if it cannot setuid, or if it cannot run child.
Otherwise its exit code is the same as that of child.
SEE ALSO
supervise(8), svc(8), svok(8), svstat(8), svscanboot(8), svscan(8), readproctitle(8), fghack(8), pgrphack(8), multilog(8), tai64n(8),
tai64nlocal(8), envuidgid(8), envdir(8), softlimit(8), setlock(8)
http://cr.yp.to/daemontools.html
setuidgid(8)