NFS4MAPID(8)                System Manager's Manual               NFS4MAPID(8)

NAME
     nfs4mapid – shows NFSv4 mappings from uids or gids to over the wire
     string names and string names to uids or gids.

SYNOPSIS
     nfs4mapid [-G] string name
     nfs4mapid [-G] GUID
     nfs4mapid -u uid
     nfs4mapid -g gid

DESCRIPTION
     In the first form, nfs4mapid shows translations from NFSv4 string
     representations of users, and with the -G option, groups, to the
     corresponding local uids and gids.  In the second form shows the
     translations from opendirectoy GUIDS to NFSv4 strings. The well known
     strings names (which are distinguished by a trailing ‘@’ ), such as
     "OWNER@" and "GROUP@" are represented locally by GUIDs and may not map to
     uids or gids. To map those GUIDS to NFSv4 strings use this form. The
     first form can be used to map the well known ids to GUIDs.  nfs4mapid
     does this by looking at the trailing ‘@’ sign. Note that NFSv4 well known
     names are always groups and are used in ACEs.  In the third form, it
     shows the mapping from uids to the NFSv4 user@domain form.  Similarly, in
     the last form it shows the mapping from gids to the NFSv4 group@domain.
     nfs4mapid will also show the intermediate GUID translation if used. The
     NFSv4 domain name should be set with dscl(1).  See opendirectory(8) for
     instructions.

     -G      Map an NFSv4 string to a gid.

     -u      Map a uid to an NFSv4 user@domain string.

     -g      Map a gid to an NFSv4 group@domain string.

NOTES
     nfs4mapid uses a privileged nfs client system call to pass the
     translation request down to the kernel, so results will be the same as a
     request coming from an NFSv4 server. Because of this, nfs4mapid must be
     run with root privileges.

SEE ALSO
     dscl(1), nfs(5), opendirectoryd(8), mount_nfs(8),

HISTORY
     The nfs4mapid utility first appeared in OSX 10.10

macOS 15.2                     February 20, 2014                    macOS 15.2