tail / grep

[Mike Ballon]

It's a good file name, it contains a "dirtyword" list which is why the
grep -f is used because it allows grep to read from a file line by line.

----- Original Message -----
From: "Doug Stanfield" <DOUGS at oceanic.com>
To: "Linux Users Anonymous" <luau at luau.hi.net>
Sent: Thursday, November 16, 2000 10:16 PM
Subject: [luau] Re: tail / grep


> From the man page for 'grep':
>
> -f FILE, --file=FILE
>               Obtain patterns from FILE, one per line.  The empty
>               file contains zero patterns, and  therfore  matches
>               nothing.
>
> I think the -f flag is causing grep to open a file to get the pattern to
> match.  What follows is not a legitimate file name so it either hangs
trying
> to open nothing or matches nothing.
>
> What is it you're trying to do with the -f on the grep?
>
> -Doug-
>
> > -----Original Message-----
> > From: Mike Ballon [mailto:calzonie at hawaii.rr.com]
> > Sent: Thursday, November 16, 2000 9:14 PM
> > To: Linux Users Anonymous
> > Subject: [luau] Re: tail / grep
> >
> >
> > 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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