10-16-2002
Which os would indeed be a big help here. In general if usera has root permissions, the uid must be 0. Make the uid some other number. And remember that no two users should have the same uid.
You can't put one group into another group. A group is a colection of users. Not sure what you're looking for here.
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LEARN ABOUT MOJAVE
user_from_uid
PWCACHE(3) BSD Library Functions Manual PWCACHE(3)
NAME
pwcache -- cache password and group entries
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <pwd.h>
char *
user_from_uid(uid_t uid, int nouser);
#include <grp.h>
char *
group_from_gid(gid_t gid, int nogroup);
DESCRIPTION
The user_from_uid() function returns the user name associated with the argument uid. The user name is cached so that multiple calls with the
same uid do not require additional calls to getpwuid(3). If there is no user associated with the uid, a pointer is returned to a string rep-
resentation of the uid, unless the argument nouser is non-zero, in which case a NULL pointer is returned.
The group_from_gid() function returns the group name associated with the argument gid. The group name is cached so that multiple calls with
the same gid do not require additional calls to getgrgid(3). If there is no group associated with the gid, a pointer is returned to a string
representation of the gid, unless the argument nogroup is non-zero, in which case a NULL pointer is returned.
SEE ALSO
getgrgid(3), getpwuid(3)
HISTORY
The user_from_uid() and group_from_gid() functions first appeared in 4.4BSD.
BSD
June 9, 1993 BSD