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Date:      Mon, 5 Feb 2001 21:47:14 +0100
From:      Cliff Sarginson <cliff@raggedclown.net>
To:        Joe.Warner@smed.com
Cc:        lucas@slb.to, freebsd-questions@FreeBSD.ORG
Subject:   Re: Help me make FreeBSD shine
Message-ID:  <20010205214713.A1054@raggedclown.net>
In-Reply-To: <852569EA.005F58D2.00@Deimos.smed.com>; from Joe.Warner@smed.com on Mon, Feb 05, 2001 at 10:25:14AM -0700
References:  <852569EA.005F58D2.00@Deimos.smed.com>

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On Mon, Feb 05, 2001 at 10:25:14AM -0700, Joe.Warner@smed.com wrote:
> 
> 
> Hey thanks!
> 
> Right now, I'm just starting with something simple.
> 
> I created this script:
> 
> #!/bin/sh
> 
> grep -v "#" /etc/hosts | awk '{print $1}' | while read host
> do
> ping -c 1 $host
> done >results
       ^^^^^^^^
> 
> 
> ...and it works, except I want the output to be dumped
> into a text file.
> 
> Do you know how I should change this script so I could
> do that?
> 
> If this script doesn't do what my manager wants, I'll
> definitely try yours.
> 
> Thanks
> 
> Joe
> 
> 
> 
> 
> 
> 
> 
> 
> |--------+----------------------->
> |        |          Lucas Bergman|
> |        |          <lucas@slb.to|
> |        |          >            |
> |        |                       |
> |        |          02/05/01     |
> |        |          09:50 AM     |
> |        |          Please       |
> |        |          respond to   |
> |        |          lucas        |
> |        |                       |
> |--------+----------------------->
>   >---------------------------------------------------------|
>   |                                                         |
>   |       To:     Joe Warner/SMS@SMS                        |
>   |       cc:     freebsd-questions@freebsd.org             |
>   |       Subject:     Re: Help me make FreeBSD shine       |
>   >---------------------------------------------------------|
> 
> 
> 
> 
> 
> > Is there a way that I could write up some simple shell script that
> > would ping the IP addresses of these systems and then log the output
> > into a file that I could make accessible through a web browser?  If
> > so, I could set it to run in the CRON scheduler every four hours at
> > specific times/days.
> 
> Look at
> 
>   http://www.slb.to/~lucas/hacks/iplist-1.0.tar.gz
> 
> This contains two scripts, iplist.sh and iplist2html.sh.  The first
> pings all the IP addresses on an 8-bit IP network and logs when each
> was last heard from (in Unix time format, seconds since midnight on
> 19700101).  The second script creates a web page that shows which IP
> addresses are "free" (have not been heard from in greater than some
> number of seconds, by default twenty days).  This helps out my old
> employer who refused to use DHCP but who wanted an easy way to assign
> free IP addresses.
> 
> The package also contains a trivial C program which prints the current
> time in seconds since the Unix epoch.
> 
> I have a cron job that runs `sh /path/to/iplist.sh' every few hours
> and `sh /path/to/iplist2html.sh >/path/to/freeip.html' afterward.  I
> would advise *not* running these scripts as root.  Also, ideally you
> would run `sh iplist2html.sh >freeip.html.tmp && mv freeip.html.tmp
> freeip.html' so that freeip.html isn't truncated if iplist2html.sh
> bombs in the middle of a run.  iplist.sh does not corrupt its data
> file if it crashes.
> 
> Hopefully, this is similar enough to what you want to do that it will
> get you started.
> 
> Lucas
> 
> 
> 
> 
> 
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