It’s not that unusual to need to see/check/verify the binary output of a shell command in HEX format. Clearly, I mean without picking up a HEX editor or something like that. Last time, it happened to me a few days ago when I was to inspect the content of a base64-encoded string. The tool to the rescue is (of course not limited to)
xxd, to get the HEX representation for some binary content you just need to call it with no argument:
echo -n 'Computer says: "Hello World!"' | xxd
Depending on the case it could be more insightful to also have the ASCII values column. That’s simply done by calling
echo -n 'Computer says: "Hello World!"' | xxd -C
Which results in such a neat output:
00000000: 436f 6d70 7574 6572 2073 6179 733a 2022 Computer says: " 00000010: 4865 6c6c 6f20 576f 726c 6421 22 Hello World!"
xxd can do things the other way. For instance, may you need to turn a HEX string into a binary content, just call
-r option, like this:
echo -n "0x48656c6c6f20576f726c6421" | xxd -r
Which would result in:
There are more
xxd options which you can find by checking:
About Regular Encounters
I’ve decided to record my daily encounters with professional issues on a somewhat regular basis. Not all of them are equally important/unique/intricate, but are indeed practical, real, and of course, textually minimal.