The software called achart is a user-friendly, command-line ASCII chart tool that is easy to use.
The chart that achart displays is in one of the common bases such as octal, decimal, or hexadecimal. Moreover, this tool can optionally show the special control-code names such as NUL, ESC, etc. When you run achart without any parameters, it will show you a chart in decimal representation just like this:
$ achart ASCII chart, decimal representation
0 ^@ | 1 ^A | 2 ^B | 3 ^C | 4 ^D | 5 ^E | 6 ^F | 7 ^G
8 ^H | 9 ^I | 10 ^J | 11 ^K | 12 ^L | 13 ^M | 14 ^N | 15 ^O
16 ^P | 17 ^Q | 18 ^R | 19 ^S | 20 ^T | 21 ^U | 22 ^V | 23 ^W
24 ^X | 25 ^Y | 26 ^Z | 27 ^[ | 28 ^\ | 29 ^] | 30 ^^ | 31 ^_
32 SP | 33 ! | 34 " | 35 # | 36 $ | 37 % | 38 & | 39 '
40 ( | 41 ) | 42 * | 43 + | 44 , | 45 - | 46 . | 47 /
48 0 | 49 1 | 50 2 | 51 3 | 52 4 | 53 5 | 54 6 | 55 7
56 8 | 57 9 | 58 : | 59 ; | 60 < | 61 = | 62 > | 63 ?
64 @ | 65 A | 66 B | 67 C | 68 D | 69 E | 70 F | 71 G
72 H | 73 I | 74 J | 75 K | 76 L | 77 M | 78 N | 79 O
80 P | 81 Q | 82 R | 83 S | 84 T | 85 U | 86 V | 87 W
88 X | 89 Y | 90 Z | 91 [ | 92 \ | 93 ] | 94 ^ | 95 _
96 ` | 97 a | 98 b | 99 c | 100 d | 101 e | 102 f | 103 g
104 h | 105 i | 106 j | 107 k | 108 l | 109 m | 110 n | 111 o
112 p | 113 q | 114 r | 115 s | 116 t | 117 u | 118 v | 119 w
120 x | 121 y | 122 z | 123 { | 124 | | 125 } | 126 ~ | 127 ^?
If you want the chart to show you a different base, you can determine the base on the command line. Moreover, you can show the lower
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