[96375] in RedHat Linux List
Re: PING Program
daemon@ATHENA.MIT.EDU (Linux User)
Mon Oct 26 18:02:41 1998
Date: Mon, 26 Oct 1998 18:01:51 -0500 (EST)
From: Linux User <linuxuser@linuxtest.fellows.denison.edu>
To: redhat-list@redhat.com
In-Reply-To: <199810231631.LAA31840@isunix.it.ilstu.edu>
Resent-From: redhat-list@redhat.com
Reply-To: redhat-list@redhat.com
Tim:
Why do you do the scan in parts 1-50, 51- etc.
(others: see script below)
thanks,
Fahd Sultan
Software Techie
Denison U.
linuxuser@linuxtest.fellows.denison.edu
sultan_f@denison.edu
On Fri, 23 Oct 1998, Tim Hockin wrote:
>
> eek, that ping script I sent was rather old. everyone who loked at it. it
> can be made significantly more efficient . here is the revision:
>
>
> Tim
>
> #!/bin/sh
> # pingit
> # by Tim Hockin <thockin@ais.net>
> # 1997
>
> # time to wait for a response
> SLEEP=1
>
> #ping a whole class C - easily modified for a smaller range
> if [ foo$1 = foo ]; then
> echo "USAGE: $0 - <ipnetwork>"
> echo " eg: $0 192.168.1 "
> exit
> else
> IP=$1
> fi
>
> I=1
> S=55
>
> while [ $I -lt 255 ]; do
> while [ $I -lt $S ]; do
> (ping -c1 $IP.$I > /dev/null 2>&1 && echo $IP.$I is up &)
> I=$((I+1))
> done
>
> # give memory a break...
> sleep $SLEEP
>
> # if it hasn't answered by now, it is probably not alive..
> killall ping > /dev/null 2>&1
>
> # increment our upper bound
> S=$((S+50))
> done
>
>
> --
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