#!/bin/sh

uname_s="$(uname -s)"

case "${uname_s}" in
    FreeBSD)
        sysctl -n kern.disks
    ;;
    OpenBSD|NetBSD)
        sysctl -n hw.disknames | grep -Eo '[lsw]d[0-9]+' | xargs
    ;;
    Linux)
        if command -v lsblk > /dev/null
        then
            # exclude ram disks, floppies and cdroms
            # https://www.kernel.org/doc/Documentation/admin-guide/devices.txt
            lsblk -e 1,2,11 -dno name | xargs
        else
            printf "Don't know how to list disks for %s operating system without lsblk, if you can please submit a patch\n" "${uname_s}" >&2
        fi
    ;;
    *)
        printf "Don't know how to list disks for %s operating system, if you can please submit a patch\n" "${uname_s}" >&2
    ;;
esac

exit 0