tail / grep

[Mike Ballon]

I think the grep -f is putting it in a loop from what I can tell, so
basically the next command ">" is never getting run.  It works great if you
just use |grep word with the tail, the grep -f is what's throwing things off
for sure.

This was actually just something I was playing with and now it's got my
stumped.

----- Original Message -----
From: "Joseph Key" <keyj001 at hawaii.rr.com>
To: "Linux Users Anonymous" <luau at luau.hi.net>
Sent: Thursday, November 16, 2000 6:34 PM
Subject: [luau] Re: tail / grep


> I did some more testing and found.  If you remove the grep the command
works
> like it should.  I put tee instead of redirecting and found that it works
> without the grep but as soon as you try and grep the output of the tail
all
> output stops till the tail command is killed (if you control-c the whole
> command the command line and output file are empty).  I tried putting what
> is to be grepped on the command line and still no output.
>
> Joseph Key
>
> ----- Original Message -----
> From: "Mike Ballon" <calzonie at hawaii.rr.com>
> To: "Linux Users Anonymous" <luau at luau.hi.net>
> Sent: Thursday, November 16, 2000 6:10 PM
> Subject: [luau] Re: tail / grep
>
>
> > I'll have to wait until tomorrow to try this, thanks.
> >
> > ----- Original Message -----
> > From: "Joseph Key" <keyj001 at hawaii.rr.com>
> > To: "Linux Users Anonymous" <luau at luau.hi.net>
> > Sent: Thursday, November 16, 2000 5:15 PM
> > Subject: [luau] Re: tail / grep
> >
> >
> > > I did some testing of a tail followed by a grep redirected to a file.
I
> > > found that when the command is run without the -f in the tail it works
> > fine.
> > > Why are you using -f in tail?  I think the problem is to get a useful
> > output
> > > you need to end with a control-c this kills the tail and grep before
> they
> > > can redirect.  The file is open but doesn't get anything till the
> command
> > > ends.  I found that if you ps ax and just kill the tail command the
> > redirect
> > > works like it should.  Hope this helps.
> > >
> > > Joseph Key
> > >
> > > ----- Original Message -----
> > > From: "Mike Ballon" <calzonie at hawaii.rr.com>
> > > To: "Linux Users Anonymous" <luau at luau.hi.net>
> > > Sent: Thursday, November 16, 2000 9:48 AM
> > > Subject: [luau] tail / grep
> > >
>
> > >
> > > > Here's a good one:
> > > >
> > > > tail -f /var/log/squid/access.log | grep -f /etc/Sex.txt >
> > /tmp/busted.txt
> > > >
> > > > The tail part of the command runs, the grep runs (-f read from file)
> but
> > I
> > > can
> > > > not get it to output to the /tmp/bustex.txt file to save my life and
I
> > > can't
> > > > figure out why.  Without using the redirection at the end the
results
> of
> > > the
> > > > grep are displayed on the crt no problem.
> > > >
>
> > > > What I'm thinking is that the grep -f puts the command in a loop and
> it
> > > never
> > > > gets to the > redirect portion, you think?
> > > >
> > > >
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>
>
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