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 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 )
 
 utmp and utmpx monitoring daemon - utmpd ( Index Term Link )
 
 utmp2wtmp - create an entry for each user logged on in file /var/adm/wtmpx ( Index Term Link )
 
 utmpd - utmp and utmpx monitoring daemon ( 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 )