Date: Sun, 26 Dec 1999 16:44:45 +0000 From: Mark Ovens <mark@ukug.uk.freebsd.org> To: aunty <aunty@comcen.com.au> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: shell quoting problem? Message-ID: <19991226164445.F327@marder-1> In-Reply-To: <19991227032424.E17780@comcen.com.au> References: <19991227014716.D17780@comcen.com.au> <19991226154822.C327@marder-1> <19991227032424.E17780@comcen.com.au>
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On Mon, Dec 27, 1999 at 03:24:24AM +1100, aunty wrote:
> On Sun, Dec 26, 1999 at 03:48:22PM +0000, Mark Ovens wrote:
> > On Mon, Dec 27, 1999 at 01:47:16AM +1100, aunty wrote:
> > > After setting some variables in a bourne shell script, I want it
> > > to run a command like
> > > finger @nas1 | egrep "Host|tom|dick|harry"
> > > where nas1, tom, dick, and harry are expanded from variables.
> > >
> > > I can see _why_ things like this don't work
> > > finger \@${serv} | egrep \"Host${pipes-and-names}\"
> > > but can't figure out how to get all those quotes and pipes behaving.
> > >
> > > Is there a way to do this or must I resort to perl?
> > >
> >
> > Not quite sure exactly what you are trying to do here,
>
> If you go
> finger @host.domain.com
> you get a list of users online (usually forbidden these days).
> I'm grepping that list for particular people's names.
> These names and the host name are all generated from a script.
>
> > but whenever I use egrep(1) I always use ``()'' thus:
> >
> > # finger @nas1 | egrep '(tom|dick|harry)'
> >
> > Does this help at all?
>
> Yes thanks, that's a big improvement for the right hand side.
>
> Now it echoes fine from the script but I get no output from the
> command, probably the fault of that pesky pipe in the middle.
>
You mean like this:
marder-1# cat > xxx
#!/bin/sh
finger ${1}@ukug.uk.freebsd.org | egrep "(${1}|${2})"
^D
marder-1# chmod 777 xxx
marder-1# ./xxx mark fred
Login: mark Name: Mark Ovens
Directory: /home/dogma/mark Shell: /usr/local/bin/bash
Login: markg Name: Mark A. Gutierrez
Directory: /home/dogma/markg Shell: /usr/local/bin/tcsh
marder-1#
If you're using ``${var} etc. than you need to use double quotes or
the vars don't get expanded.
HTH
> > Merry Xmas.
>
> Ooooooh, yeah I forgot :-) We've just finished Boxing Day here.
> Merry whatever you're celebrating!
>
Boxing Day evening.
>
> --
>
> Regards,
> -*Sue*-
>
--
"there's a long-standing bug relating to the x86 architecture
that allows you to install Windows too"
-Matthew D. Fuller
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