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convert hex string to base64 string and viceversa
# convert hex string to base64 string
| xxd -r -p | base64
# convert base64 string to hex string
| base64 -d | od -t x1 -An
# Example: the whole circle in one command
# convert base64 to binary, to sha256 checksum (string in hex format), to decoded hex data (xxd -r),
# to base64 string, to base64 decoded data (base64 -d), back to hex string
awk '{print $2}' /etc/ssh/ | base64 -d | sha256sum -b | awk '{print $1}' | xxd -r -p | base64 | base64 -d | od -t x1 -An
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