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LUIT(1) 										  LUIT(1)

NAME
       luit - Locale and ISO 2022 support for Unicode terminals

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

DESCRIPTION
       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  applica-
       tions 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 below.

OPTIONS
       -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 output.

       -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 encoding.

       +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  out-
	      put 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 usu-
	      ally g2 except for EUC locales, where it is g1.

       -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.

EXAMPLES
       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 sup-
       port 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 multilin-
       gual 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

FILES
       /usr/share/X11/locale/locale.alias
	      The file mapping locales to locale encodings.

SECURITY
       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  ordi-
       nary user will leave the tty world-writable; this is a security hole, and luit will gener-
       ate 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.

BUGS
       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.

SEE ALSO
       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).

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

X Version 11				    luit 1.1.1					  LUIT(1)
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