man pages section 1: User Commands
    
U
 
 u370 - get processor type truth value ( Index Term Link )
 
 u3b - get processor type truth value ( Index Term Link )
 
 u3b2 - get processor type truth value ( Index Term Link )
 
 u3b5 - get processor type truth value ( Index Term Link )
 
 u3b15 - get processor type truth value ( Index Term Link )
 
 ucblinks - adds /dev entries to give SunOS 4.x compatible names to SunOS 5.x devices ( Index Term Link )
 
 ul - underline text ( Index Term Link )
 
 ulimit - set or get limitations on the system resources available to the current shell and its descendents ( Index Term Link )
 
 umask - shell built-in function to restrict read/write/execute permissions ( Index Term Link )
 
 unalias - shell built-in functions to create your own pseudonym or shorthand for a command or series of commands ( Index Term Link )
 
 uname - print name of current system ( Index Term Link )
 
 unbind the reference from an FNS name - fnunbind ( Index Term Link )
 
 uncompress - uncompress files ( Index Term Link )
 
 underline text - ul ( Index Term Link )
 
 unexpand - unexpand SPACE characters to TAB characters ( Index Term Link )
 
 unhash - shell built-in functions to evaluate the internal hash table of the contents of directories ( Index Term Link )
 
 unifdef - resolve and remove ifdef'ed lines from C program source ( Index Term Link )
 
 uniq - report or filter out repeated lines in a file ( Index Term Link )
 
 units - converts quantities expressed in standard scales to other scales ( Index Term Link )
 
 UNIX, convert text file from DOS format to ISO format - dos2unix ( Index Term Link )
 
 unix2dos - convert text file from ISO format to DOS format ( Index Term Link )
 
 UNIX-to-UNIX commands
  uucp - uucp ( Index Term Link )
  uulog - uucp ( Index Term Link )
  uuname - uucp ( Index Term Link )
 
 unlimit - set or get limitations on the system resources available to the current shell and its descendents ( Index Term Link )
 
 unpack - expand compressed files ( Index Term Link )
 
 unset - shell built-in functions to determine the characteristics for environmental variables of the current shell and its descendents ( Index Term Link )
 
 unsetenv - shell built-in functions to determine the characteristics for environmental variables of the current shell and its descendents ( Index Term Link )
 
 until - shell built-in functions to repetitively execute a set of actions while/until conditions are evaluated TRUE ( Index Term Link )
 
 update and examine attributes associated with FNS named object - fnattr ( Index Term Link )
 
 update groups of programs - sysV-make ( Index Term Link )
 
 update last modified date of file - touch ( Index Term Link )
 
 update programs - make ( Index Term Link )
 
 uptime - show how long the system has been up ( Index Term Link )
 
 user ID, change user IDs of files - chown ( Index Term Link )
 
 user IDs
  display a list of all valid user names - dispuid ( Index Term Link )
  prompts for user ID - ckuid ( Index Term Link )
  provides error message for user ID - erruid ( Index Term Link )
  provides help message for user ID - helpuid ( Index Term Link )
  validates user ID - valuid ( Index Term Link )
 
 users
  display effective name - whoami ( Index Term Link )
  display group membership - groups ( Index Term Link )
  display information about local and remote users - finger ( Index Term Link )
  get the name of the user running the process - logname ( Index Term Link )
  list user login information - listusers ( Index Term Link )
  talk to another user - talk ( Index Term Link )
  who is logged in, and what are they doing - w ( Index Term Link )
  who is logged in on local machines - rwho ( Index Term Link )
  who is logged in on remote machines - rusers ( Index Term Link )
  who is on the system - who ( Index Term Link )
  write to another user - write ( Index Term Link )
 
 users, network, Internet user name directory service - whois ( Index Term Link )
 
 users - display users on system ( Index Term Link )
 
 uucp - UNIX-to-UNIX copy ( Index Term Link )
 
 uucp
  log - uulog ( Index Term Link )
  uucp status inquiry - uustat ( Index Term Link )
 
 uudecode - decode binary file ( Index Term Link )
 
 uuencode - encode binary file ( Index Term Link )
 
 uuglist - print list of service grades available ( Index Term Link )
 
 uulog - UUCP log ( Index Term Link )
 
 uuname - UUCP list of names ( Index Term Link )
 
 uustat - uucp status inquiry ( Index Term Link )
 
 uux - system to system command execution ( Index Term Link )