gistfile1.txt

w_try_mv()
{
    mv_src="${*: -2:1}"
    mv_dst="${*: -1:1}"

    if [ "${mv_src^^}" != "${mv_dst^^}" ]; then
        w_try mv "$@"
        return
    fi

    w_try mv "${@: -$#:$#-2}" "$mv_src" "${mv_src}_"
    w_try mv "${@: -$#:$#-2}" "${mv_src}_" "${mv_dst}"
}