ssh-fingerprints.md

Get ssh thumbprint or ssh fingerprint of every entry in known_hosts as json:

ssh-keygen -l -f known_hosts  | awk '{ print "{" "\042host\042:\042" $3 "\042" ",\042thumbprint\042:\042" $2 "\042" ",\042alg\042:\042" $4 "\042" ",\042size\042:\042" $1 "\042" "}"}' | sort | jtbl

formatted:

ssh-keygen -l -f known_hosts \
    | awk '{ print "{" "\042host\042:\042" $3 "\042" ",\042thumbprint\042:\042" $2 "\042" ",\042alg\042:\042" $4 "\042" ",\042size\042:\042" $1 "\042" "}"}' \
    | sort \
    | jtbl

Awk needs octal escapes (hex is not portable) for quotes to avoid clashing with the shell. I chose double quotes 042 instead of single quotes 047

The host is first so the sort groups entries by host. The default order of known_hosts is newest entry at bottom.

jtbl is a nifty util to pretty-print the json as a table. Remove it to process the json lines with jq or any other json processor.