Check the manpage for your system's mail command. Many have an
option for just such a situation - where you don't want to receive
an empty email (usually from cron).
On FreeBSD, it's -E
-E Do not send messages with an empty body. This is useful for pip-
ing errors from cron(8) scripts.
My crontab entry looks like this:
30 15 * * * tmda-pending -C -b -s | mail -E -s 'TMDA pending summary' \
[EMAIL PROTECTED] > /dev/null 2>&1
-jon
--
Jon Nathan
[EMAIL PROTECTED]
* David Grimberg <[EMAIL PROTECTED]> [02-04-2003 17:45]:
>
> I was trying to setup my crontab to notify me of unconfirmed pending mail,
> but I only wanted to receive the email when once for each email (I know
> that's the -C option), but I also only want an email sent if their is any
> pending email. Right now if I use
>
> tmda-pending -CbsO 2d | mail -s "TMDA pending" sentinel > /dev/null
>
> I still get an empty email when no pending mail exists. So I figured I'd
> drop it into an if statement and use the -p flag to when checking for mail
> ready for reporting:
>
> if (tmda-pending -CpbsO 2d | grep . > /dev/null) then (
> tmda-pending -CbsO 2d|mail -s "TMDA pending" sentinel
> ) fi
>
> The only problem with this was that the -C and -p flags didn't play well
> together. The reported pending mail still got cached by the first
> tmda-pending call that was supposed to be pretending, so the only email I
> would get was an empty email if I had any previously uncached and
> unconfirmed email.
>
> My next thought was to use the -O and -Y flags without the -C flag in my
> test as follows:
>
> if (tmda-pending -bsO 2d -Y 3d | grep . > /dev/null) then (
> tmda-pending -CbsO 2d|mail -s "TMDA pending" sentinel
> ) fi
>
> Not as graceful as the first option would have been, but doable, except that
> the -O and -Y flags didn't play well together. In .69 the test returns no
> matches (I think that in .68 I got back the -O matches). Ideally I'd
> like -O 1d -Y 2d to return the messages the fall in-between and optionally
> for -Y 1d -O 2d return everything but the messages between the two.
>
> Since neither of these solutions worked I'm using this kluge:
>
> if (tmda-pending -TbO 2d|awk '{print $1}' | tmda-pending -TbY 3d -|grep . >
> /dev/null) then (
> tmda-pending -CbsO 2d|mail -s "TMDA pending" sentinel > /dev/null
> ) fi
>
> While this is actually working for me I really would have preferred either
> of the two prior solutions to have worked, such that when I use -Cp I only
> see messages that have not been cached, but the displayed messages do not
> get cached, and -O in combination with -Y operates as noted above.
>
> Dave
>
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> http://tmda.net/lists/listinfo/tmda-users
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