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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 encod-
ing 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 Be verbose.
-c Function as a simple converter from standard input to standard
-x Exit as soon as the child dies. This may cause luit to loose
data at the end of the child's output.
Set the child's name (as passed in argv).
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
+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 gener-
ating 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
-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
Set the charset initially selected in G0. The default depends
on the locale, but is usually ASCII.
Set the charset initially selected in G1. The default depends
on the locale.
Set the charset initially selected in G2. The default depends
on the locale.
Set the charset initially selected in G3. The default depends
on the locale.
Log into filename all the bytes received from the child.
Log into filename all the bytes sent to the terminal emulator.
-- 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
$ 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, ver-
sions of Emacs that do not speak UTF-8 well can use luit for multilin-
$ luit -encoding 'ISO 8859-1' emacs -nw
And then, in Emacs,
M-x set-terminal-coding-system RET iso-2022-8bit-ss2 RET
The system-wide encodings directory.
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), run-
ning 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
None of this complexity should be necessary. Stateless UTF-8 through-
out 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).
Luit was written by Juliusz Chroboczek <email@example.com> for the
4.5.0 XFree86 LUIT(1)