xxd is a great tool. I have seen it be use in so many places. For some weird
reason though it seems to come packaged with vim?. Don’t know about other
distros, but that’s the case with Arch. Seems like xxd was created by Bram
and is a part of vim source code. Haven’t looked into it further, but that’s
what I concluded.
Anyways here’s a small example:
echo -en "89504e470d0a1a0a0000000d4948445200000001000000010100000000376ef9240000000a4944415478016360000000020001737501180000000049454e44ae426082" | xxd -r -p
The -r does the reverse of what xxd is meant to normally do, i.e
print hexdump of a binary data. The -p just tells it to treat the input as
‘plain hexdump’ (which is a single line of hex digits without any other
formatting)