On 2003-01-05 16:16, Roman Neuhauser <[EMAIL PROTECTED]> wrote:
> # [EMAIL PROTECTED] / 2003-01-04 14:02:46 +1030:
> > cat > $myfile
> > server=`egrep -i < $myfile "In: [HE][HE]LO"|sed 's/^.*LO *//' `
> > if [ "$server" = "" ]; then
> > server=`egrep -i < $myfile "^Subject.*errors from "|sed 's/^Subject.*errors
>from //; s:\[.*::g' `
> > fi
> >
> > Confusing, isn't it? The thing is, this program is a filter. The
> > first line copies stdin to $myfile for future (multiple) readings.
>
> Ok, so you pipe the Postfix-generated message into B which slurps it
> into $myfile and that is where you access it... I'm just a luser, so
> excuse me if this is nonsense, but do you do that because stdin is
> not seekable?
Sort of. Standard input can be seekable. When you redirect it using
something like:
% blah < filename
The blah program can seek its stdin. Pipes on the other hand are not
seekable.
- Giorgos
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