https://invisible-island.net/xterm/
koi8rxterm - X terminal emulator for KOI8-R environments
koi8rxterm [ xterm-options ]
koi8rxterm is a wrapper around the xterm(1) program that invokes the
latter program with the "KOI8RXTerm" X resource class set. All
arguments to koi8rxterm are passed to xterm without processing; the
-class and -k8 options should not be specified because they are used by
the wrapper. See the xterm manual page for more information on xterm-
options.
The environment's locale settings (see "ENVIRONMENT" below) are used to
discern the locale's character set. If no current locale can be
determined, the locale "ru_RU.KOI8-R" (the Russian language as used in
the territory of Russia, with the KOI8-R character set) is assumed.
The locale(1) utility is used to determine whether the system supports
the selected locale. If it does not, koi8rxterm will exit with an
error and report the output of locale.
Note: koi8rxterm may produce unexpected results if the current locale
is set to one in which the KOI8-R character encoding is not supported,
or if fonts using that encoding are not available. In the Debian
system, the "xfonts-cyrillic" package provides the fonts that
koi8rxterm uses by default. To change the fonts koi8rxterm uses, edit
the /etc/X11/app-defaults/KOI8RXTerm file.
A similar wrapper, uxterm(1), is available for Unicode UTF-8
environments.
LC_ALL, LC_CTYPE, LANG
The values of these variables are checked, in order, to
determine the character set used by the current locale.
koi8rxterm was written by Branden Robinson and is very heavily based on
uxterm, by Thomas Dickey. The assistance of Jurij Smakov was
invaluable in sanity-checking its operation.
locale(1), locale(7), uxterm(1), xterm(1) Patch #396 2024-12-02 KOI8RXTERM(1)