> On Dec 22, 2016, at 3:51 AM, Stéphane MERLE <[email protected]>
> wrote:
>
> First, I save the message in the file descriptor 3
>
> msg=$(mktemp /tmp/msg.XXXXXX) || exit 75
> cat > $msg || { rm $msg; exit 75; }
> exec 3< $msg || { rm $msg; exit 75; }
> rm $msg
>
> then I use it by rewinding it :
>
> perl -e 'open IN, "<&", 3; seek(IN, 0, 0);'
I meant to use "sysseek" there, not "seek" by the way, though
in practice it seems that "seek" has the same effect, the former
is more correct.
>
> is there a way to rewind without using perl ?
If you need to avoid tools like Perl that expose system call
interfaces, just go with the "trap" approach and don't "pre-unlink"
the message file.
msg=$(mktemp /tmp/msg.XXXXXX)
trap "rm -f $msg" EXIT
trap "rm -f $msg; exit 75" HUP INT TERM
cat > $msg
...
if grep "..." $msg >/dev/null; then
set -- "$@" "$additional_recipient"
fi
...
# Final command. Shell will remove the temp file and exit with
# Sendmail's exit code.
/usr/sbin/sendmail "$@"
--
Viktor.
