achart -

achart is a simple command-line ASCII chart utility.

Most programmers need an ASCII chart now and then, and I go tired of not having one around so I wrote this very simple tool achart. It displays an ASCII character chart in one of the common bases -- octal, decimal, or hexadecimal -- and can optionally show the special control-code names (NUL, ESC, etc.).

Run without parameters, it shows a chart in decimal:

$ 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 ^?

The base is determine by a number on the command line, and by prefixing the base with a dash, the lower 32 characters are shown as their control-character names. The valid bases are 8, 10 (the default), and 16.

For instance:

$ achart -16
ASCII chart, hex representation

00 NUL | 01 SOH | 02 STX | 03 ETX | 04 EOT | 05 ENQ | 06 ACK | 07 BEL
08 BS | 09 HT | 0A LF | 0B VT | 0C FF | 0D CR | 0E SO | 0F SI
10 DLE | 11 DC1 | 12 DC2 | 13 DC3 | 14 DC4 | 15 NAK | 16 SYN | 17 ETB
18 CAN | 19 EM | 1A SUB | 1B ESC | 1C FS | 1D GS | 1E RS | 1F US
20 SP | 21 ! | 22 " | 23 # | 24 $ | 25 % | 26 & | 27 '
28 ( | 29 ) | 2A * | 2B + | 2C , | 2D - | 2E . | 2F /
30 0 | 31 1 | 32 2 | 33 3 | 34 4 | 35 5 | 36 6 | 37 7
38 8 | 39 9 | 3A : | 3B ; | 3C < | 3D = | 3E > | 3F ?
40 @ | 41 A | 42 B | 43 C | 44 D | 45 E | 46 F | 47 G
48 H | 49 I | 4A J | 4B K | 4C L | 4D M | 4E N | 4F O
50 P | 51 Q | 52 R | 53 S | 54 T | 55 U | 56 V | 57 W
58 X | 59 Y | 5A Z | 5B [ | 5C | 5D ] | 5E ^ | 5F _
60 ` | 61 a | 62 b | 63 c | 64 d | 65 e | 66 f | 67 g
68 h | 69 i | 6A j | 6B k | 6C l | 6D m | 6E n | 6F o
70 p | 71 q | 72 r | 73 s | 74 t | 75 u | 76 v | 77 w
78 x | 79 y | 7A z | 7B { | 7C | | 7D } | 7E ~ | 7F DEL

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