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iso2022(5)


NAME

  iso2022, iso-2022, ISO-2022 - A character encoding mechanism standardized
  by the International Standards Organization (ISO)


DESCRIPTION

  The ISO-2022 standard defines a mechanism for handling single-byte and
  multibyte characters. The standard specifies four classes of character
  sets:

    ·  The 94-charset class, which contains character sets with 94 positions
       (single-byte characters).  Examples are the ASCII and JIS X0201
       character sets.

    ·  The 96-charset class, which contains character sets with 96 positions
       (single-byte characters). Examples are the ISO Latin series of
       character sets.

    ·  The 94x94-charset class, which contains character sets with 94x94
       positions (2-byte characters). Examples are the GB 2312 and the CNS
       11643 character sets.

    ·  The 96x96-charset class,	 which contains character sets with 96x96
       positions (2-byte characters).

  In the ISO-2022 standard, four registers, called G0, G1, G2 and G3, are
  used to reference a character set. Before a character set can be used, the
  character set must be assigned, or designated, to one of these registers.
  The designation of a character set is done by using an escape sequence in
  the following format:

       ESC [I] F

  In this format:

  I   Is an intermediate character that is used to designate a character set
      to one of the registers (G0, G1, G2, oR G3).

  F   Is a unique final character of a particular character set.

  The designation of a character set, whose final character is F, to
  different registers is as follows:

  ESC $ F
      Designates a multibyte character set (94x94 or 96x96) to G0.

  ESC ( F
      Designates a character set in the 94-charset class to G0.

  ESC ) F
      Designates a character set in the 94-charset class to G1.

  ESC * F
      Designates a character set in the 94-charset class to G2.

  ESC + F
      Designates a character set in the 94-charset class to G3.

  ESC - F
      Designates a character set in the 96-charset class to G1.

  ESC . F
      Designates a character set in the 96-charset class to G2.

  ESC / F
      Designates a character set in the 96-charset class to G3.


SEE ALSO

  Commands: locale(1)

  Others: ascii(5), i18n_intro(5), iso2022jp(5), l10n_intro(5)

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