man pages section 1M: System Administration Commands
    
U
 
 uadmin — administrative control ( Index Term Link )
 
 ufs, mount — mount_ufs ( Index Term Link )
 
 ufs file system debugger — fsdb_ufs ( Index Term Link )
 
 umount — unmount file systems and remote resources ( Index Term Link )
 
 umountall — unmount multiple file systems ( Index Term Link )
 
 unshare — make local resource unavailable for mounting by remote systems ( Index Term Link )
 
 unshare_nfs — make local NFS filesystem unavailable for mounting by remote systems ( Index Term Link )
 
 unshareall — make multiple resources unavailable for mounting ( Index Term Link )
 
 updatehome — update the home directory copy and link files for the current label ( Index Term Link )
 
 user IDs, become a non-role user — su ( Index Term Link )