From what I recall xxd is actually part of the vim distribution, so it's common, but not everywhere. An approximate standard (coreutils) alternative is `od -x' (although it doesn't include the ASCII readable char column at the right, which can be annoying)
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xxd is a pretty nice hexdump substitute that has a reverse mode of operation (-r), turning a hexdump into binary.
From what I recall xxd is actually part of the vim distribution, so it's common, but not everywhere. An approximate standard (coreutils) alternative is `od -x' (although it doesn't include the ASCII readable char column at the right, which can be annoying)