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LUIT(1)                 FreeBSD General Commands 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 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
       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.

       +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.

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 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

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.

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

XFree86                          Version 4.7.0                         LUIT(1)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXAMPLES | FILES | SECURITY | BUGS | SEE ALSO | AUTHOR

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