Create a public key for an AWS private key

private_to_public.sh

#!/bin/bash

# props to original at https://gist.github.com/zircote/1243501

if [[ "${1}" == "" ]]; then
        echo "usage: ${0} some_private_key.pem"
        echo ""
        echo "The result will be a public key at $(pwd)/some_private_key.pub"

        exit 1
fi

PRIVATE=${1}
BASE=$(basename -s .pem ${PRIVATE})
PUBLIC=${BASE}.pub

if [[ -e ${PUBLIC} ]]; then
        echo "error: public key ${PUBLIC} already exists"

        exit 1
fi

ssh-keygen -y -f ${PRIVATE} > ${PUBLIC}

if [[ ${?} -ne 0 ]]; then
        rm -fr ${PUBLIC}
fi