Control Character knowledge popularization

The ASCII character set is defined as 128 characters (0 to 127). The first 32 values are non-printable control characters (0-31 and 127), such as ^ G 7
Bell ).

Control characters:

Char	Octal	Decimal	Hexadecimal	Control-Key	Control Action
Nul	0	0	0	^ @	NULL Character
Soh	1	1	1	^	Start of heading, = console interrupt
STX	2	2	2	^ B	Start of text, maintenance mode on HP Console
Etx	3	3	3	^ C	End of Text
EOT	4	4	4	^ D	End of transmission, not the same as etb
Enq	5	5	5	^ E	Enquiry, goes with ack; old HP Flow Control
ACK	6	6	6	^ F	Acknowledge, clears Enq logon hand
Bel	7	7	7	^ G	Bell, rings the bell...
BS	10	8	8	^ H	Backspace, works on HP terminals/computers
HT	11	9	9	^ I	Horizontal tab, move to next tab stop
Lf	12	10	A	^ J	Line feed
Vt	13	11	B	^ K	Vertical Tab
FF	14	12	C	^ L	Form feed, page eject
Cr	15	13	D	^ M	Carriage Return
So	16	14	E	^ N	Shift out, alternate Character Set
Si	17	15	F	^ O	Shift in, resume defaultn Character Set
DLE	20	16	10	^ P	Data Link escape
DC1	21	17	11	^ Q	Xon, with xoff to pause listings; ": Okay to send ".
DC2	22	18	12	^ R	Device Control 2, block-mode Flow Control
DC3	23	19	13	^ S	Xoff, with Xon is term = 18 Flow Control
Dc4	24	20	14	^ T	Device Control 4
Nak	25	21	15	^ U	Negative acknowledge
SYN	26	22	16	^ V	Synchronous idle
Etb	27	23	17	^ W	End transmission block, not the same as EOT
Can	30	24	17	^ X	Cancel line, MPE echoes !!!
Em	31	25	19	^ Y	End of medium, control-y interrupt
Sub	32	26	1a	^ Z	Substitute
ESC	33	27	1B	^ [	Escape, next character is not echoed
FS	34	28	1c	^ \	File Separator
GS	35	29	1D	^]	Group Separator
RS	36	30	1e	^	Record separator, block-mode Terminator
Us	37	31	1f	^ _	Unit Separator

Print characters

Char	Octal	Dec	HEX	Description
SP	40	32	20	Space
!	41	33	21	Exclamation mark
"	42	34	22	Quotation Mark (& quot; in HTML)
#	43	35	23	Cross Hatch (number sign)
$	44	36	24	Dollar sign
%	45	37	25	Percent sign
&	46	38	26	Ampersand
`	47	39	27	Closing single quote (apostrophe)
(	50	40	28	Opening parentheses
)	51	41	29	Closing parentheses
*	52	42	2a	Asterisk (Star, multiply)
+	53	43	2b	Plus
,	54	44	2c	Comma
-	55	45	2d	Hyphen, Dash, minus
.	56	46	2e	Period
/	57	47	2f	Slant (forward slash, divide)
0	60	48	30	Zero
1	61	49	31	One
2	62	50	32	Two
3	63	51	33	Three
4	64	52	34	Four
5	65	53	35	Five
6	66	54	36	Six
7	67	55	37	Seven
8	70	56	38	Eight
9	71	57	39	Nine
:	72	58	3A	Colon
;	73	59	3b	Semicolon
<	74	60	3c	Less than sign (& lt; in HTML)
=	75	61	3D	Equals sign
>	76	62	3E	Greater than sign (& gt; in HTML)
?	77	63	3f	Question mark
@	100	64	40	At-sign
A	101	65	41	Uppercase
B	102	66	42	Uppercase B
C	103	67	43	Uppercase C
D	104	68	44	Uppercase d
E	105	69	45	Uppercase E
F	106	70	46	Uppercase F
G	107	71	47	Uppercase g
H	110	72	48	Uppercase H
I	111	73	49	Uppercase I
J	112	74	4A	Uppercase J
K	113	75	4b	Uppercase K
L	114	76	4C	Uppercase L
M	115	77	4d	Uppercase m
N	116	78	4e	Uppercase n
O	117	79	4f	Uppercase o
P	120	80	50	Uppercase P
Q	121	81	51	Uppercase Q
R	122	82	52	Uppercase R
S	123	83	53	Uppercase s
T	124	84	54	Uppercase t
U	125	85	55	Uppercase u
V	126	86	56	Uppercase v
W	127	87	57	Uppercase W
X	130	88	58	Uppercase x
Y	131	89	59	Uppercase y
Z	132	90	5A	Uppercase Z
[	133	91	5b	Opening square bracket
\	134	92	5C	Reverse slant (backslash)
]	135	93	5D	Closing square bracket
^	136	94	5E	Caret (circumflex)
_	137	95	5f	Underscore
`	140	96	60	Opening single quote
A	141	97	61	Lowercase
B	142	98	62	Lowercase B
C	143	99	63	Lowercase C
D	144	100	64	Lowercase d
E	145	101	65	Lowercase E
F	146	102	66	Lowercase F
G	147	103	67	Lowercase G
H	150	104	68	Lowercase H
I	151	105	69	Lowercase I
J	152	106	6a	Lowercase J
K	153	107	6b	Lowercase K
L	154	108	6c	Lowercase L
M	155	109	6d	Lowercase m
N	156	110	6e	Lowercase n
O	157	111	6f	Lowercase o
P	160	112	70	Lowercase P
Q	161	113	71	Lowercase Q
R	162	114	72	Lowercase R
S	163	115	73	Lowercase s
T	164	116	74	Lowercase t
U	165	117	75	Lowercase u
V	166	118	76	Lowercase v
W	167	119	77	Lowercase W
X	170	120	78	Lowercase x
Y	171	121	79	Lowercase y
Z	172	122	7A	Lowercase Z
{	173	123	7b	Opening curly brace
|	174	124	7c	Vertical Line
}	175	125	7D	Cloing curly brace
~	176	126	7E	Tilde (approximate)
Del	177	127	7f	Delete (rubout), cross-hatch box

Shell processing control characters:

Sometimes there will be a control character in the text, such as test1:

You must use cat-V or cat-a to view the control character ^.

21.703073010384102 ^ a24.714308723165203 ^ a27.38294431629967 ^ a32.307091875806 ^ a76429 ^ a209438

Convert ^ A to a space. ^ A is 1 (or 01, 001), and a space is 40 (or 040 ). Redirect to test2.

Tr-s "[\ 001]" [\ 040 *] "<test1> Test2