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[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Y] [Z] \U string escape  \u string escape  ualarm( )  uc( )  ucfirst( )  UDP (User Datagram Protocol)     writing clients for      writing servers for  umask values  uname( )  unbuffered input/output  2nd  3rd  4th  undef( ), compared to delete( )  undefined values  underscore (_), file stat cache  Unicode      character database      combined characters, canonicalizing strings with      converting Microsoft files to      encodings, XML and      named characters, using      reading and writing from filehandles      strings         treating as octets          treating as single characters  Uniform Resource Locators  [See URLs] unimport( )  unions of lists      computing  unique list elements, extracting  universal character code  UNIVERSAL module  Unix     domain sockets  2nd      I/O layers  unix layer  2nd  UnixDate( )  unlink( ), removing directories and contents  unpack( )  2nd      fixed-length records  unread bytes, determining number  unshift( ), circular lists  updating random-access files  uppercase, converting to lowercase  URI::Escape module  URI::Heuristic module  2nd  uri_escape( )  urlify program  URLs (Uniform Resource Locators)      expanding tildes in filenames      external redirection      extracting from HTML      fetching from Perl scripts      putting HTML links around      transparently storing information in  use autouse pragma  use bytes pragma  use charnames pragma  use constant pragma  use lib pragma  use locale pragma  use operator  use overload pragma  use pragmas  2nd      trapping errors in  Usenet news messages  User Datagram Protocol  [See UDP] user interfaces      adding text to images      checking for waiting input      clearing the screen      controlling programs with Expect      determining window size      dialog boxes, creating with Tk      DOS shell window, removing      editing input      full-screen mode      graphing data  2nd      managing screen      manipulating terminal directly      menus, creating with Tk      multiscreen CGI scripts      reading from keyboard      reading passwords without echo      ringing terminal bell      tcapdemo program      testing programs if running interactively      text color      thumbnailing images      Tk resize events  User::pwent module  userstats program  usleep( )  UTF-8  2nd  utf8 I/O layer  utime( ), timestamps

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