Look into a language called "Expect". And don't be
intimidated by the fact that it's a new language to
learn. Most likely you can run a script in cron that
will basically say:

spawn ssh
send [ssh command]
expect [normal response]
send [sftp command]

Obviously it's a little more complex than that, but
the beauty of Expect is that it's only a *little* more
complex than that.

It's not the most secure thing to do though. But you
can mitigate that risk through permissions and maybe
not giving the user a shell (not sure if that breaks
sftp...).

The book for this is called "Exploring Expect" but you
could get away with a quick online tutorial like the
one here:

http://www.raycosoft.com/rayco/support/expect_tutor.html

Hope that helps.
Keith

--- Jack Xiao <jack_xiao99hotmail.com> wrote:
> Hi,
>
> I got ssh work without typing the username and
> password. But need further
> step, use sftp without typing username and passowrd.
> I have thought if ssh
> works fine, there's no problem with sftp. But I was
> still asked for the
> password when using sftp. Any ideas will be
> appreciated.
>
> In addition, is it less secure for the ssh if there
> is no passphrase?
>
> Thanks.
>
> Jack
>
>
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