[Chapter 21] ASCII Character Set

you need to represent nonprinting characters in some printed form, such as octal. For example, the echo and trnnn. Also, the od


Decimal	Octal	Hex	Character	Remark
0	000	00	CTRL-@	NUL (Null prompt)
1	001	01	CTRL-A
2	002	02	CTRL-B	STX (Start of text)
3	003	03	CTRL-C	ETX (End of text)
4	004	04	CTRL-D
5	005	05	CTRL-E	ENQ (Enquiry)
6	006	06	CTRL-F	ACK (Acknowledge)
7	007	07	CTRL-G	BEL (Bell)
8	010	08	CTRL-H	BS (Backspace)
9	011	09	CTRL-I	HT (Horizontal tab)
10	012	0A	CTRL-J	LF (Linefeed)
11	013	0B	CTRL-K	VT (Vertical tab)
12	014	0C	CTRL-L
13	015	0D	CTRL-M
14	016	0E	CTRL-N	SO (Shift out)
15	017	0F	CTRL-O	SI (Shift in)
16	020	10	CTRL-P
17	021	11	CTRL-Q	DC1 (X-ON)
18	022	12	CTRL-R	DC2
19	023	13	CTRL-S	DC3 (X-OFF)
20	024	14	CTRL-T	DC4
21	025	15	CTRL-U
22	026	16	CTRL-V
23	027	17	CTRL-W
24	030	18	CTRL-X	CAN (Cancel)
25	031	19	CTRL-Y	EM (End of medium)
26	032	1A	CTRL-Z	SUB (Substitute)
27	033	1B	CTRL-[	ESC (Escape)
28	034	1C	CTRL-\	FS (File separator)
29	035	1D	CTRL-]
30	036	1E	CTRL-^
31	037	1F	CTRL-_	US (Unit separator)
127	177	7F


Decimal	Octal	Hex	Character	Remark
32	040	20		Space
33	041	21	`!`	Exclamation Point
34	042	22	`"`	Double quote
35	043	23	#	Sharp Sign
36	044	24	$	Dollar Sign
37	045	25	%	Percent Sign
38	046	26	&	Ampersand
39	047	27	`'`	Apostrophe
40	050	28	(	Left Parenthesis
41	051	29	)	Right Parenthesis
42	052	2A	*	Asterisk
43	053	2B	+	Plus Sign
44	054	2C	`,`	Comma
45	055	2D	-	Hyphen
46	056	2E	`.`	Period
47	057	2F	/	Slash (Virgule)
48	060	30	0
49	061	31	1
50	062	32	2
51	063	33	3
52	064	34	4
53	065	35	5
54	066	36	6
55	067	37	7
56	070	38	8
57	071	39	9
58	072	3A	`:`	Colon
59	073	3B	`;`	Semicolon
60	074	3C	<	Left Angle Bracket
61	075	3D	&=	Equal Sign
62	076	3E	>
63	077	3F	?	Question Mark
64	100	40	@	"At" Sign
65	101	41	A
66	102	42	B
67	103	43	C
68	104	44	D
69	105	45	E
70	106	46	F
71	107	47	G
72	110	48	H
73	111	49	I
74	112	4A	J
75	113	4B	K
76	114	4C	L
77	115	4D	M
78	116	4E	N
79	117	4F	O
80	120	50	P
81	121	51	Q
82	122	52	R
83	123	53	S
84	124	54	T
85	125	55	U
86	126	56	V
87	127	57	W
88	130	58	X
89	131	59	Y
90	132	5A	Z
91	133	5B	[	Left Square Bracket
92	134	5C	\	Backslash
93	135	5D	]
94	136	5E	&^	Caret
95	137	5F	&_	Underscore
96	140	60	`	Back Quote
97	141	61	a
98	142	62	b
99	143	63	c
100	144	64	d
101	145	65	e
102	146	66	f
103	147	67	g
104	150	68	h
105	151	69	i
106	152	6A	j
107	153	6B	k
108	154	6C	l
109	155	6D	m
110	156	6E	n
111	157	6F	o
112	160	70	p
113	161	71	q
114	162	72	r
115	163	73	s
116	164	74	t
117	165	75	u
118	166	76	v
119	167	77	w
120	170	78	x
121	171	79	y
122	172	7A	z
123	173	7B	{	Left Curly Brace
124	174	7C	\|	Vertical Bar
125	175	7D	}	Right Curly Brace
126	176	7E	`~`	Tilde

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