View Source: ascii(7) - Waikato Linux Users Group

Edit PageHistory Diff Info LikePages
!!!ASCII

----
!!NAME


ascii - the ASCII character set encoded in octal, decimal, and hexadecimal
!!DESCRIPTION


ASCII is the American Standard Code for Information Interchange. It is a 7-bit code. Many 8-bit codes (such as ISO 8859-1, the Linux default character set) contain ASCII as their lower half. The international counterpart of ASCII is known as ISO 646.


The following table contains the 128 ASCII characters.


C program '\X' escapes are noted.

|Oct|Dec|Hex|Char| |Oct|Dec|Hex|Char
|000|0|00|NUL '\0' (Null)| |100|64|40|@
|001|1|01|SOH (Start heading)| |101|65|41|A
|002|2|02|STX (Start text)| |102|66|42|B
|003|3|03|ETX (End text)| |103|67|43|C
|004|4|04|EOT (End of transmission)| |104|68|44|D
|005|5|05|ENQ (Enquiry)| |105|69|45|E
|006|6|06|ACK (Acknowledge)| |106|70|46|F
|007|7|07|BEL '\a' (ring bell)| |107|71|47|G
|010|8|08|BS '\b' (backspace)| |110|72|48|H
|011|9|09|HT '\t' (horizontal tab)| |111|73|49|I
|012|10|0A|LF '\n' (line feed)| |112|74|4A|J
|013|11|0B|VT '\v' (vertical tab)| |113|75|4B|K
|014|12|0C|FF '\f' (form feed)| |114|76|4C|L
|015|13|0D|CR '\r' (carriage return)| |115|77|4D|M
|016|14|0E|SO (shift out)| |116|78|4E|N
|017|15|0F|SI (shift in)| |117|79|4F|O
|020|16|10|DLE (data link escape)| |120|80|50|P
|021|17|11|DC1 (device control 1)| |121|81|51|Q
|022|18|12|DC2 (dev. cntl 2)| |122|82|52|R
|023|19|13|DC3 (dev. cntl 3)| |123|83|53|S
|024|20|14|DC4 (dev. cntl 4)| |124|84|54|T
|025|21|15|NAK (negative acknowledge)| |125|85|55|U
|026|22|16|SYN (synchronous idle)| |126|86|56|V
|027|23|17|ETB (end of transmission block)| |127|87|57|W
|030|24|18|CAN (cancel)| |130|88|58|X
|031|25|19|EM (end of medium)| |131|89|59|Y
|032|26|1A|SUB (substitute)| |132|90|5A|Z
|033|27|1B|ESC (escape)| |133|91|5B|[
|034|28|1C|FS (file separator)| |134|92|5C|\
|035|29|1D|GS (group separator)| |135|93|5D|]
|036|30|1E|RS (record separator)| |136|94|5E|^^
|037|31|1F|US (unit separator)| |137|95|5F|_
|040|32|20|SPACE| |140|96|60|`
|041|33|21|!| |141|97|61|a
|042|34|22|"| |142|98|62|b
|043|35|23|#| |143|99|63|c
|044|36|24|$| |144|100|64|d
|045|37|25|%| |145|101|65|e
|046|38|26|&| |146|102|66|f
|047|39|27|'| |147|103|67|g
|050|40|28|(| |150|104|68|h
|051|41|29|)| |151|105|69|i
|052|42|2A|*| |152|106|6A|j
|053|43|2B|+| |153|107|6B|k
|054|44|2C|,| |154|108|6C|l
|055|45|2D|-| |155|109|6D|m
|056|46|2E|.| |156|110|6E|n
|057|47|2F|/| |157|111|6F|o
|060|48|30|0| |160|112|70|p
|061|49|31|1| |161|113|71|q
|062|50|32|2| |162|114|72|r
|063|51|33|3| |163|115|73|s
|064|52|34|4| |164|116|74|t
|065|53|35|5| |165|117|75|u
|066|54|36|6| |166|118|76| v
|067|55|37|7| |167|119|77|w
|070|56|38|8| |170|120|78|x
|071|57|39|9| |171|121|79|y
|072|58|3A|:| |172|122|7A|z
|073|59|3B|;| |173|123|7B|{
|074|60|3C|<| |174|124|7C| vertical bar
|075|61|3D|=| |175|125|7D|}
|076|62|3E|>| |176|126|7E|~
|077|63|3F|?| |177|127|7F|DEL


!!HISTORY


An __ascii__ manual page appeared in Version 7 AT&T UNIX.


On older terminals, the underscore code is displayed as a left arrow, called backarrow, the caret is displayed as an up-arrow and the vertical bar has a hole in the middle.


Uppercase and lowercase characters differ by just one bit and the ASCII character 2 differs from the double quote by just one bit, too. That made it much easier to encode characters mechanically or with a non-microcontroller-based electronic keyboard and that pairing was found on old teletypes.


The ASCII standard was published by the United States of America Standards Institute (USASI) in 1968.
!!SEE ALSO

iso_8859_1(7), iso_8859_15(7), iso_8859_7(7)
----
See also the utf8(7) man page.
This page is a man page (or other imported legacy content). We are unable to automatically determine the license status of this page.
Last edited on Wednesday, May 5, 2004 11:06:42 am by JohnMcPherson
Edit PageHistory Diff Info LikePages