[ILUG] grep or awk

[Patton, Tony]

there is no plan to upgrade anytime soon.

the reason that i am looking to do this is that we have a lot of users
who connect to an oracle database over telnet and print by going thru a
menu of printers.

this list is getting crowded, (about 8 or so), so i want to provide
different menus for the users depending on their ip address. ie
172.200.20.x = mis printers, 172.200.30.x = administration printers.

-----Original Message-----
From: Chris Higgins [mailto:chris.higgins at horizon.ie]
Sent: Monday, September 10, 2001 4:53 PM
To: Irish Linux Users Group (E-mail)
Subject: Re: [ILUG] grep or awk 


We're talking about the contents of the wtmp/utmp files, as interpreted
by
the command 'who'

If you upgrade your version of who, and the formatting changes slightly,
you run the risk of breaking your scripts (in strange and wonderful
ways).

Would it not make more sense to query the files directly so that 
you can be sure that the information is more reliable than grep'ing
from 'who'

Chris (just my e0.02) - (see: man utmp)

> Fergal Daly wrote:
> > sed 's/.*(\(.*\)).*\|.*/\1/'
> > 
> > will turn lines that don't have a matching pair of brackets into
blanks,
> > 
> > > >     xxxxxxx     ttyqb       Sep 10 11:33
> > > > (xxx.xxx.xxx.xxx)
> 
> I think 
> sed -e 's/^[^(]*(\([^)]*\)).*$/\1/'
> is slightly better, in that it will pick up the first matching pair of
> brackets, rather than (on this line, say) printing (for example) "on
> this line, say) printing (for example" rather than "on this line, say"
-
> but that's a matter of choice, if you're guaranteed that you'll only
> have one pair of brackets.
> 
> Cheers,
> Dave 
> 
> -- 
> David Neary,               E-Mail dave.neary at palamon.ie
> Palamon Technologies Ltd.  Phone +353-1-634-5059
> 
> -- 
> Irish Linux Users' Group: ilug at linux.ie
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information.
> List maintainer: listmaster at linux.ie

-- 
** Chris Higgins                         e: chris.higgins at horizon.ie
**
** Technical Business Development        tel: +353-1-6204916
**
** Horizon Technology Group              fax: +353-1-6204949
**



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