od alternative with better defaults, but not POSIX 7.
Ubuntu bsdmainutils package.
Uses saner hexadecimal defaults and shows ASCII side by side.
Saner than hexdump.
Very close to hexdump, but also shows ASCII visualization on the side of hexa visualization.
Example:
echo -en {a..z} "\n \x01" | hd
Output:
00000000 61 20 62 20 63 20 64 20 65 20 66 20 67 20 68 20 |a b c d e f g h |
00000010 69 20 6a 20 6b 20 6c 20 6d 20 6e 20 6f 20 70 20 |i j k l m n o p |
00000020 71 20 72 20 73 20 74 20 75 20 76 20 77 20 78 20 |q r s t u v w x |
00000030 79 20 7a 20 0a 20 01 |y z . .|
00000037
Non ASCII and whitespace chars or control chars such as newline or \x01 are represented as dots on the ASCII side notation.
Offsets are in hexadecimal: 00, 10, 20.