A streaming hex encoding/decoding tool, pipes stdin to stdout.

Byte-for-byte, simple, not UTF8 aware (if that matters).

Throws on invalid characters unless --decode-any is used.

Decoding

> echo "6a" | hexxer -d
j

> echo "6b" | hexxer --decode
k

Encoding

> echo "j" | hexxer
6a0a

> echo -n "j" | hexxer
6a