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function checksum()

{
action=$1
shift
if [[ ( $action == "-c" || $action == "--check" ) && $1 == *.* ]]; then
type="${1/*./}"
else type=$1
shift
fi
case $type in
md5 )
checktool=md5sum
;;
sha1 | sha )
checktool=sha1sum
;;
sha224 )
checktool=sha224sum
;;
sha256 )
checktool=sha256sum
;;
sha384 )
checktool=sha384sum
;;
sha512 )
checktool=sha512sum
;;
esac
case $action in
-g | --generate )
for file in "${@}"; do
$checktool "${file}" > "${file}".$type
done
;;
-c | --check )
for file in "${@}"; do
if [[ "${file}" == *.$type ]]; then
$checktool --check "${file}"
else $checktool --check "${file}".$type
fi
done
;;
-h | --help )
;;
esac
}



# MD5 checksum
function md5()
{
echo -n $@ | md5sum
}