Date: Sun, 5 Jan 2003 18:53:14 +0200 From: Giorgos Keramidas <keramida@ceid.upatras.gr> To: FreeBSD Questions <questions@FreeBSD.ORG> Subject: Re: What are the SMTP rules for sending mail to FreeBSD Message-ID: <20030105165314.GA634@gothmog.gr> In-Reply-To: <20030105151622.GC669@freepuppy.bellavista.cz> References: <3E0DBCFC.5040907@quadtelecom.com> <5.1.1.6.2.20021228111607.0243f108@mail.go2france.com> <20021229002511.GD92510@wantadilla.lemis.com> <20021229174612.GR348@freepuppy.bellavista.cz> <20021230005622.GE19243@wantadilla.lemis.com> <20030102154044.GK348@freepuppy.bellavista.cz> <20030102155305.GL348@freepuppy.bellavista.cz> <20030104033246.GC12462@wantadilla.lemis.com> <20030105151622.GC669@freepuppy.bellavista.cz>
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On 2003-01-05 16:16, Roman Neuhauser <neuhauser@bellavista.cz> wrote: > # grog@FreeBSD.org / 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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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