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#!/bin/sh
# Like ssh-keygen -lf, but for a file such as authorized_keys, which
# may contain multiple keys.
#
# Usage: sshfprs.sh file [prefix]
set -ue
file="$1"
prefix="${2:-}"
while read pk; do
# ssh-keygen can't read from STDIN, and ash doesn't have the '<<<'
# construct, so we save each pubkey in a temporary file
pkf=$(mktemp)
echo "$pk" > "$pkf"
echo "${prefix}$(ssh-keygen -lf $pkf)"
rm "$pkf"
done < "$file"
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