luit - Locale and ISO 2022 support for Unicode terminals


   luit [ options ] [ -- ] [ program [ args ] ]


   Luit is a filter that can be run between an arbitrary application and a
   UTF-8 terminal emulator.  It will convert application output  from  the
   locale's  encoding  into  UTF-8,  and convert terminal input from UTF-8
   into the locale's encoding.

   An application  may  also  request  switching  to  a  different  output
   encoding  using  ISO 2022  and  ISO 6429 escape sequences.  Use of this
   feature is discouraged: multilingual applications should be modified to
   directly generate UTF-8 instead.

   Luit  is  usually  invoked transparently by the terminal emulator.  For
   information about running luit from  the  command  line,  see  EXAMPLES


   -h     Display some summary help and quit.

   -list  List the supported charsets and encodings, then quit.

   -V     Print luit's version and quit.

   -v     Be verbose.

   -c     Function  as  a simple converter from standard input to standard

   -p     In startup, establish  a  handshake  between  parent  and  child
          processes.  This is needed for some systems, e.g., FreeBSD.

   -x     Exit  as  soon  as  the child dies.  This may cause luit to lose
          data at the end of the child's output.

   -argv0 name
          Set the child's name (as passed in argv[0]).

   -encoding encoding
          Set up luit to use encoding rather  than  the  current  locale's

   +oss   Disable interpretation of single shifts in application output.

   +ols   Disable interpretation of locking shifts in application output.

   +osl   Disable  interpretation  of character set selection sequences in
          application output.

   +ot    Disable interpretation of all sequences and pass  all  sequences
          in  application output to the terminal unchanged.  This may lead
          to interesting results.

   -k7    Generate seven-bit characters for keyboard input.

   +kss   Disable generation of single-shifts for keyboard input.

   +kssgr Use GL codes after  a  single  shift  for  keyboard  input.   By
          default,  GR  codes  are  generated  after  a  single shift when
          generating eight-bit keyboard input.

   -kls   Generate locking shifts (SO/SI) for keyboard input.

   -gl gn Set the initial assignment of GL.  The argument should be one of
          g0,  g1,  g2  or  g3.  The default depends on the locale, but is
          usually g0.

   -gr gk Set the initial assignment of GR.  The default  depends  on  the
          locale,  and  is  usually g2 except for EUC locales, where it is

   -g0 charset
          Set the charset initially selected in G0.  The  default  depends
          on the locale, but is usually ASCII.

   -g1 charset
          Set  the  charset initially selected in G1.  The default depends
          on the locale.

   -g2 charset
          Set the charset initially selected in G2.  The  default  depends
          on the locale.

   -g3 charset
          Set  the  charset initially selected in G3.  The default depends
          on the locale.

   -ilog filename
          Log into filename all the bytes received from the child.

   -olog filename
          Log into filename all the bytes sent to the terminal emulator.

   -alias filename
          the locale alias file
          (default: /usr/share/X11/locale/locale.alias).

   --     End of options.


   The most typical use of luit is to adapt an instance of  XTerm  to  the
   locale's encoding.  Current versions of XTerm invoke luit automatically
   when it is needed.  If you are using an older release of  XTerm,  or  a
   different terminal emulator, you may invoke luit manually:

          $ xterm -u8 -e luit

   If  you  are  running  in  a  UTF-8  locale but need to access a remote
   machine that doesn't support UTF-8, luit can adapt the remote output to
   your terminal:

          $ LC_ALL=fr_FR luit ssh legacy-machine

   Luit  is  also useful with applications that hard-wire an encoding that
   is different from the one normally used on the system or  want  to  use
   legacy  escape  sequences  for  multilingual  output.   In  particular,
   versions of Emacs that do  not  speak  UTF-8  well  can  use  luit  for
   multilingual output:

          $ luit -encoding 'ISO 8859-1' emacs -nw

   And then, in Emacs,

          M-x set-terminal-coding-system RET iso-2022-8bit-ss2 RET


          The file mapping locales to locale encodings.


   On  systems  with  SVR4  ("Unix-98") ptys (Linux version 2.2 and later,
   SVR4), luit should be run as the invoking user.

   On systems  without  SVR4  ("Unix-98")  ptys  (notably  BSD  variants),
   running  luit  as  an  ordinary user will leave the tty world-writable;
   this is a security hole, and luit will generate a  warning  (but  still
   accept  to  run).   A possible solution is to make luit suid root; luit
   should drop privileges sufficiently early to make this safe.   However,
   the  startup  code  has  not  been exhaustively audited, and the author
   takes no responsibility for any resulting security issues.

   Luit will refuse to run if it is installed  setuid  and  cannot  safely
   drop privileges.


   None   of   this  complexity  should  be  necessary.   Stateless  UTF-8
   throughout the system is the way to go.

   Charsets with a non-trivial intermediary byte are not yet supported.

   Selecting alternate sets of control characters  is  not  supported  and
   will never be.


   xterm(1), unicode(7), utf-8(7), charsets(7).
   Character Code Structure and Extension Techniques (ISO 2022, ECMA-35).
   Control Functions for Coded Character Sets (ISO 6429, ECMA-48).


   The  version  of  Luit  included  in  this X.Org Foundation release was
   originally written by Juliusz Chroboczek <> for  the
   XFree86  Project  and  includes additional contributions from Thomas E.
   Dickey required for newer releases of xterm(1).

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