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Full Discussion: ascii code
Top Forums Shell Programming and Scripting ascii code Post 302342776 by methyl on Monday 10th of August 2009 05:50:01 PM
Old 08-10-2009
Unix:
To see the unusual characters in a file in octal (the less unusual characters come out as \x. e.g. Tab is "\t").

Code:
sed -n l filename

Once you know the octal representation you can get the character into an environment variable with unix echo. My echo doesn't have the "-n" switch (no newline).

e.g. For the simple case of a tab character:

Code:
TAB=`echo "\0011\c"`

We can then use ${TAB} in a sed.

The common characters are listed in unix "man ascii". In your case the character is probably a higher value than those in "man ascii" but this "man" page is a good reference for converting between number bases (octal, decimal, hexadecimal).



Now for M$ Windows:
Once you have the octal value of the character you can convert to decimal (mathematics).

Say if you need to generate the unusual character in Windows Notepad:
Ensure that numlock is on.
Press and hold ALT then type the decimal version of the character on the numeric keyboard.
For example, the Euro Sign (€) is ALT+0128 .

Last edited by methyl; 08-10-2009 at 07:03 PM.. Reason: Various typos and missing tags
 

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OD(1)							      General Commands Manual							     OD(1)

NAME
od - octal, decimal, hex, ascii dump SYNOPSIS
od [ -format ] [ file ] [ [+]offset[.][b] [label] ] DESCRIPTION
Od displays file, or it's standard input, in one or more dump formats as selected by the first argument. If the first argument is missing, -o is the default. Dumping continues until end-of-file. The meanings of the format argument characters are: a Interpret bytes as characters and display them with their ACSII names. If the p character is given also, then bytes with even parity are underlined. The P character causes bytes with odd parity to be underlined. Otherwise the parity bit is ignored. b Interpret bytes as unsigned octal. c Interpret bytes as ASCII characters. Certain non-graphic characters appear as C escapes: null=, backspace=, formfeed=f, new- line= , return= , tab= ; others appear as 3-digit octal numbers. Bytes with the parity bit set are displayed in octal. d Interpret (short) words as unsigned decimal. f Interpret long words as floating point. h Interpret (short) words as unsigned hexadecimal. i Interpret (short) words as signed decimal. l Interpret long words as signed decimal. o Interpret (short) words as unsigned octal. s[n] Look for strings of ascii graphic characters, terminated with a null byte. N specifies the minimum length string to be recognized. By default, the minimum length is 3 characters. v Show all data. By default, display lines that are identical to the last line shown are not output, but are indicated with an ``*'' in column 1. w[n] Specifies the number of input bytes to be interpreted and displayed on each output line. If w is not specified, 16 bytes are read for each display line. If n is not specified, it defaults to 32. x Interpret (short) words as hexadecimal. An upper case format character implies the long or double precision form of the object. The offset argument specifies the byte offset into the file where dumping is to commence. By default this argument is interpreted in octal. A different radix can be specified; If ``.'' is appended to the argument, then offset is interpreted in decimal. If offset begins with ``x'' or ``0x'', it is interpreted in hexadecimal. If ``b'' (``B'') is appended, the offset is interpreted as a block count, where a block is 512 (1024) bytes. If the file argument is omitted, an offset argument must be preceded by ``+''. The radix of the displayed address will be the same as the radix of the offset, if specified; otherwise it will be octal. Label will be interpreted as a pseudo-address for the first byte displayed. It will be shown in ``()'' following the file offset. It is intended to be used with core images to indicate the real memory address. The syntax for label is identical to that for offset. SEE ALSO
adb(1) BUGS
A file name argument can't start with ``+''. A hexadecimal offset can't be a block count. Only one file name argument can be given. It is an historical botch to require specification of object, radix, and sign representation in a single character argument. 4th Berkeley Distribution April 29, 1985 OD(1)
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