Quick way to consistently verify ssh key fingerprints of remote hosts

sshkv.sh

#!/usr/bin/env bash
################################################################################
# Author: [email protected]
# License: Apache 2 <https://opensource.org/licenses/Apache-2.0>
# Description:
#   Quick way to consistently verify ssh key fingerprints of remote hosts
################################################################################
set -euo pipefail

# validate arguments
if ([ -z ${1+x} ]); then
    printf "One argument required: {valid host name or ip address}.  Exiting.\n"
    exit 1
fi

# set variables
# host could be ip address, host name or garbage
readonly host="$1"

# Description: Check binary dependencies
# Arguments: List of binaries from args
# Output: Error message and exit
function check_binaries() {
    bins="$@"
    for bin in "${bins[@]}"; do
        if [[ -z $(command -v $bin) ]]; then
            printf "Dependency '$bin' does not appear to be installed.\n"
            printf "Exiting for now...\n"
            exit 1
        fi  
    done
}

# Description: Run bin/mw_php_sec_sniff
# Arguments: $1 = host ip address
# Outputs: ssh-keygen output as text
function validate_host_ssh_key() {
    local my_host="$1"
    local keyscan_data=$(ssh-keyscan $my_host 2> /dev/null > ~/kf)
    ssh-keygen -lf ~/kf;rm -rf ~/kf
}

# Description: Main
# Arguments: Arguments provided to the script
# Output: None
function main() {
    # set bin dependencies
    local bins=("ssh-keyscan" "ssh-keygen")
    check_binaries "${bins[@]}"
    validate_host_ssh_key "$host"
}

# Call main()
main "$@"