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 )