cpsm.sh

#!/usr/bin/env bash
METHOD='md5'
usage() {
    echo "Usage: cpsm [-m METHOD] filename [CHECKSUM]"
    exit 1
}

[ $# -eq 0 ] && usage

while getopts :m: OPTION
do
    case $OPTION in
        m)
            METHOD=$OPTARG
            ;;
        \?)
            usage
            ;;
    esac
done
shift $(($OPTIND - 1))
if [[ $# -eq 0 ]]; then
    usage
fi

CKSM=$(openssl $METHOD $1 | awk '{print $2}')
if [[ -z $2 ]];
then
    echo $CKSM
    exit 0;
fi

if [[ $CKSM == $2 ]];
then
    echo 'Match!'
else
    echo 'Not Match!'
fi