MirOS Manual: luit(1)


LUIT(1)             UNIX Programmer's Manual              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 appli-
     cation 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 emula-
     tor.  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   Be verbose.

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

     -x   Exit as soon as the child dies.  This may cause luit to
          loose 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.

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     +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 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.

     --   End of options.

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LUIT(1)             UNIX Programmer's Manual              LUIT(1)

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 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 multil-
     ingual 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/X11R6/lib/X11/fonts/encodings/encodings.dir
          The system-wide encodings directory.

     /usr/X11R6/lib/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 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.

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LUIT(1)             UNIX Programmer's Manual              LUIT(1)

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 sup-
     ported and will never be.

SEE ALSO

     xterm(1), unicode(7), utf-8(7), charsets(7). Character Code
     Structure and Extension Techniques Control Functions for
     Coded Character Sets

AUTHOR

     Luit was written by Juliusz Chroboczek <jch@pps.jussieu.fr>
     for the XFree86 project.

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