man pages section 1M: System Administration Commands
    
U
 
 ufs
  check and repair -- fsck_ufs ( Index Term Link )
  construct file system -- mkfs_ufs ( Index Term Link )
  display amount of disk space -- df_ufs ( Index Term Link )
  generate a list of pathnames vs i-numbers -- ncheck_ufs ( Index Term Link )
  incremental file system restore -- ufsrestore ( Index Term Link )
  make image copy of file system-- volcopy_ufs ( Index Term Link )
  mount -- mount_ufs ( Index Term Link )
  provide labels for ufs -- labelit_ufs ( Index Term Link )
 
 ufs file system debugger -- fsdb_ufs ( Index Term Link )
 
 ufsdump -- incremental file system dump ( Index Term Link )
 
 umount -- unmount file systems and remote resources ( Index Term Link )
 
 umountall -- unmount multiple file systems ( Index Term Link )
 
 unconfigure, undo system configuration -- sys-unconfig ( Index Term Link )
 
 UNIX system executable file containing basic operating system services -- kernel ( 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 -- multiple resources ( Index Term Link )
 
 update_drv -- modify device driver attributes ( Index Term Link )
 
 update Internet name servers interactively -- nsupdate ( Index Term Link )
 
 update super block -- sync ( Index Term Link )
 
 user IDs
  administer a new user login on the system -- useradd ( Index Term Link )
  become super user or another user -- su ( Index Term Link )
 
 user information, server, remote -- in.fingerd ( Index Term Link )
 
 user quotas, remote quota daemon -- rquotad ( Index Term Link )
 
 useradd -- administer a new user login on the system ( Index Term Link )
 
 userdel -- delete a user's login from the system ( Index Term Link )
 
 usermod -- modify a user's login information on the system ( Index Term Link )
 
 users
  list login information -- logins ( Index Term Link )
  who is doing what -- whodo ( Index Term Link )
 
 utmp2wtmp -- create an entry for each user logged on in file /var/adm/wtmpx ( Index Term Link )
 
 utmpd -- utmpx monitoring daemon ( Index Term Link )
 
 utmpx monitoring daemon -- utmpd ( Index Term Link )
 
 uucheck -- check the uucp directories and permissions file ( Index Term Link )
 
 uucico -- file transport program for uucp system ( Index Term Link )
 
 uucleanup -- uucp spool directory clean-up ( Index Term Link )
 
 uucp
  check directories and permissions file -- uucheck ( Index Term Link )
  clean-up of spool directory -- uucleanup ( Index Term Link )
  file transport program -- uucico ( Index Term Link )
  scheduler for file transport program -- uusched ( Index Term Link )
  server -- in.uucpd ( Index Term Link )
 
 uusched -- scheduler for uucp transport program ( Index Term Link )
 
 Uutry -- try to contact remote system with debugging on ( Index Term Link )
 
 uutry -- try to contact remote system with debugging on ( Index Term Link )
 
 uuxqt -- execute remote command requests ( Index Term Link )