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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

jis7

jiskanji(5)							File Formats Manual						       jiskanji(5)

NAME

       jiskanji, jiskanji7, JIS7 - A character encoding system (codeset) for Japanese

DESCRIPTION

       JIS  Kanji  is a codeset that uses the JIS X0202 symbol extension method for encoding the JIS X0208 and JIS X0201 character sets. There are
       two types of JIS Kanji encoding: 7-bit JIS Kanji code and 8-bit JIS Kanji code.

   7-bit JIS Kanji Code
       In 7-bit JIS Kanji encoding, all character values are 7-bit bytes. Characters are interpreted according to preceding in and  out  sequences
       as follows: Kanji in sequence (ESC $ B)

	      The code values following the Kanji in sequence (ESC $ B) are treated as characters in the JIS X0208 Kanji character set.  Kanji out
	      sequence (ESC ( B)

	      The code values following the Kanji out sequence (ESC ( B) are treated as ASCII characters.  Supplementary Kanji in sequence (ESC  $
	      ( D)

	      The  code  values following the supplementary Kanji in sequence (ESC $ ( D) are treated as characters in the JIS X0212 supplementary
	      Kanji character set.  User-Defined Character (UDC) in sequence (ESC $ ( 0)

	      The code values following the UDC in sequence (ESC $ ( 0) are treated as characters in the vendor-defined or user-defined  character
	      set.  Kana in (SO) and Kana out (SI) sequences

	      The  code  values  following  SO(0x0e)  and  preceding  SI(0x0f)	are treated as characters in the JIS X0201 Katakana character set.
	      Katakana in sequence (ESC ( I)

	      Code values following the Katakana in sequence (ESC ( I) are treated as characters in the JIS X0201 Katakana character set. In  this
	      case, the Kanji out sequence is used to switch back to ASCII code.

	      The Katakana in and Kanji out sequences are an alternative to using the Kana in and out sequences (SO/SI).

   8-bit JIS Kanji Code
       In  8-bit  JIS  Kanji  encoding,  the JIS X0201 Katakana characters are represented as 8-bit bytes. Using this form of encoding, in and out
       sequences have the following effect: Kanji in sequence (ESC $ B)

	      Code values following the Kanji in sequence (ESC $ B) are treated as characters in the JIS X0208 Kanji character set.  Supplementary
	      Kanji in sequence (ESC $ ( D)

	      Code values following the supplementary Kanji in sequence (ESC $ ( D) are treated as characters in the JIS X0212 supplementary Kanji
	      character set.  User-Defined Character (UDC) in sequence (ESC $ ( 0)

	      Code values following the UDC in sequence (ESC $ ( 0) are treated as vendor-defined or user-defined characters.  Kanji out  sequence
	      (ESC ( B) Code values following the Kanji out sequence (ESC ( B) are treated as ASCII characters.  Kana in and out sequences (SI/SO)

	      These sequences are ignored.

   Codeset Conversion
       The  following  codeset	converter pairs are available for converting Japanese characters between jiskanji7 or JIS7 and other encoding for-
       mats.  The RESTRICTIONS section discusses some conversion limitations that apply to these converters.

       Refer to iconv_intro(5) for an introduction to codeset conversion. For more information about the other codeset for which jiskanji7 or JIS7
       is  the	input  or  output,  see the reference page specified in the list item.	deckanji_jiskanji7 or deckanji_JIS7, jiskanji7_deckanji or
       JIS7_deckanji

	      Converting from and to the DEC Kanji codeset: deckanji(5).  eucJP_jiskanji7 or eucJP_JIS7, jiskanji7_eucJP or JIS7_eucJP

	      Converting from and to Japanese Extended UNIX Code: eucJP(5).  eucTW_jiskanji7 or eucTW_JIS7, jiskanji7_eucTW or JIS7_eucTW

	      Converting from and to Taiwanese Extended UNIX  Code:  eucTW(5).	 sdeckanji_jiskanji7  or  sdeckanji_JIS7,  jiskanji7_sdeckanji	or
	      JIS7_sdeckanji

	      Converting from and to the Super DEC Kanji codeset: sdeckanji(5).  SJIS_jiskanji7 or SJIS_JIS7, jiskanji7_SJIS or JIS7_SJIS

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

	      Shift JIS encoding format is identical to encoding in Microsoft code-pages used on PC systems. Therefore, you can use these convert-
	      ers to convert Japanese characters between JIS Kanji and PC code-page format. For general information on how  the  operating  system
	      supports PC code pages, see code_page(5).

RESTRICTIONS

       The JIS Kanji codeset is not supported directly by a locale but through code conversion (through the iconv utility, Japanese terminal (tty)
       code conversion, and so forth).

       In the codeset naming conventions used by the iconv utility, the string JIS7 indicates 7-bit JIS Kanji code  that  follows  a  Katakana	in
       sequence  and  the  string jiskanji7 indicates 7-bit JIS Kanji code entered between Kana in and out sequences.  The following sequences are
       valid for input to the iconv utility but are not generated when code is converted to jiskanji7: Kanji in (ESC $ @) Kanji in (ESC & @ ESC  $
       B) Kanji in (ESC $ ( B) Kanji in (ESC $ ( @) Supplementary Kanji in (ESC $ D) Kana in (ESC ( J) Kana in (ESC ( H)

       In the code naming conventions of the Japanese terminal, the string jis7 indicates 7-bit JIS Kanji code and the string jis8 indicates 8-bit
       JIS Kanji code. When the terminal code is set to jis7, the Kana in and out sequences (SI/SO) are used for JIS X0201 Katakana character rep-
       resentation.

SEE ALSO

       Commands: locale(1)

       Others:	ascii(5),  code_page(5),  deckanji(5),	eucJP(5),  i18n_intro(5),  i18n_printing(5),  iconv_intro(5),  iso2022jp(5),  Japanese(5),
       l10n_intro(5), sdeckanji(5), shiftjis(5)

																       jiskanji(5)
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