Characters in the ASCII set can have many aliases, depending on context. A
character's possible names include:

* Its bit pattern (binary representation).

* Its hex, decimal and octal representations.

* Its teletype mnemonic and caret-notation form (for control chars).

* Its backlash-escape form in C (for some control chars).

* Its printed form (for printables).

* Its full ISO official name in English.

* Its ISO/ECMA code table reference.

* Its name as an HTML/SGML entity.

* Slang and other names in wide use for it among hackers.

This utility accepts command-line strings and tries to interpret them as
one of the above. When it finds a value, it prints all of the names of
the character.