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Full Discussion: Escape characters in a variable
Top Forums Shell Programming and Scripting Escape characters in a variable Post 303033155 by bakunin on Sunday 31st of March 2019 10:46:30 AM
Old 03-31-2019
Quote:
Originally Posted by wisecracker
Code:
AMIGA:\u\w> ESC=$( printf "\033" )

This works but one can enter the ESC character (and most other characters) directly, at least in vi *) so you won't need a subshell: in insert mode press <CTRL>-<V> to enter the next character verbatim. If you press i.e. <CTRL>-<V> and then <ESC> the editor window will show usually this:

Code:
^[
~
~
~

This is vis way of "printing" an unprintable character. Moving over with the cursor will confirm that it is NOT a caret character followed by a opening square bracket but a single character - the ESC. You can use it exactly as this. I usually put a comment on such lines to make sure i remember that:

Code:
typeset chMyESC="^["           # WARNING: literal ESC char!

Likewise you can i.e. enter literal <ENTER> characters the same way which will look like ^M and may more.

I hope this helps.

bakunin
__________
*) i have heard rumors about other editors being out there too. They haven't been confirmed yet.
 

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LEARN ABOUT OSF1

iso-2022-jp

iso2022jp(5)							File Formats Manual						      iso2022jp(5)

NAME

       iso2022jp, iso-2022-jp, ISO-2022-JP - A character encoding system (codeset) for Japanese

DESCRIPTION

       The ISO-2022-JP codeset consists of the following character sets: ASCII

	      For information on the ASCII character set, refer to ascii(5).  JIS X0201-1976

	      Only the Roman letters in this character set are included. For details, refer to deckanji(5).  JIS X0208-1978 JIS X0208-1983

	      JIS X0208-1983 is a revised version of JIS X0208-1978 and remapped some characters of JIS X0208-1978 to other positions.

       Before  a character is used, its corresponding character set must be designated. In ISO-2022-JP, the designation of a character set is done
       by using an escape sequence as follows:

       ---------------------------------------------------------------
       Escape Sequence	 Character Set
       ---------------------------------------------------------------
       ESC ( B		 ACSII
       ESC ( J		 JIS X0201-1976 (left-hand part)
       ESC $ @		 JIS X0208-1978
       ESC $ ( 0	 User-defined characters (This range of char-
			 acters is proprietary to Compaq.)
       ESC $ B		 JIS X0208-1983
       ---------------------------------------------------------------

       It is assumed that the starting code of a line is ASCII (including CR alone and LF alone, but not including the combination CRLF). If there
       are JIS X0208 characters on a line, there must be a switch to ASCII or to the left-hand part of JIS X0201 (Roman letters) before the end of
       the line (in other words, before the CRLF, or carriage return and line feed).

       For  example, if a line starts with the ASCII character 9, followed by the JIS X0208-1978 character at row 16 column 1, the line is encoded
       as follows:

       39h ESC $ @ 30h 21h .... ESC ( B .... CRLF

       If a line starts with the JIS X0208-1978 character at row 16 column 1, followed by the ASCII character 9, then the line is encoded as  fol-
       lows:

       ESC $ @ 30h 21h ESC ( B 39h .... CRLF

       Once a character set is designated, there is no need to redesignate the character set if the adjacent character belongs to the same charac-
       ter set. For example, the following practice is not recommended:

       ESC $ B .... ESC $ B ....

       Currently, the operating system supports the ISO 2022-JP codeset only through codeset  converters;  there  is  no  direct  support  through
       locales or fonts. For your options in printing and displaying Japanese characters, refer to i18n_printing(5) and Japanese(5).

   Codeset Conversion
       The  following codeset converter pairs are available for converting Japanese characters between ISO-2022-JP and other encoding formats.	In
       converter names, the string ISO-2022-JP indicates that user-defined characters are  not	included  in  the  conversion  jwhile  the  string
       ISO-2022-JPext indicates that user-defined characters are included in the convertsion. Refer to iconv_intro(5) for an introduction to code-
       set conversion. For more information about the other codeset for which ISO-2022-JP or ISO-2022-JPext is the input or output, see the refer-
       ence page specified in the list item.  deckanji_ISO-2022-JP or deckanji_ISO-2022-JPext, ISO-2022-JP_deckanji or ISO-2022-JPext_deckanji

	      Converting  from	and  to  the  DEC  Kanji  codeset:  deckanji(5).   eucJP_ISO-2022-JP or eucJP_ISO-2022-JPext, ISO-2022-JP_eucJP or
	      ISO-2022-JPext_eucJP

	      Converting from and to Japanese Extended UNIX Code: eucJP(5).  sdeckanji_ISO-2022-JP or sdeckanji_ISO-2022-JPext, ISO-2022-JP_sdeck-
	      anji or ISO-2022-JPext_sdeckanji

	      Converting  from	and  to  the  Super DEC Kanji codeset: sdeckanji(5).  SJIS_ISO-2022-JP or SJIS_ISO-2022-JPext, ISO-2022-JP_SJIS or
	      ISO-2022-JPext_SJIS

	      Converting from and to the Shift JIS codeset: SJIS(5).

	      Note that SJIS encoding is equivalent to the Microsoft code-page format used on PC systems. Therefore, you can use these	converters
	      to convert Japanese characters between the ISO 2022-JP and PC code-page formats. See code_page(5) for information on how the operat-
	      ing system supports PC code pages.

SEE ALSO

       Commands: locale(1)

       Others:	ascii(5),  code_page(5),  deckanji(5),	eucJP(5),  i18n_intro(5),  i18n_printing(5),  iconv_intro(5),	iso2022(5),   Japanese(5),
       jiskanji(5), l10n_intro(5), sdeckanji(5), shiftjis(5)

																      iso2022jp(5)
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