topic Re: how to increment a number in Operating System - Linux

how to increment a number

Charles Holland — Fri, 20 Jul 2007 12:07:19 GMT

This is my script: (not complete yet have to incorporate a do loop and an if count is > 100 to stop

count=0
echo $count
perform some function
(($count = $count + 1))
echo " the new count is "$count

Purpose is to check 100 things and the only thing different is the last diget(s)

It can't be that hard, but it has been a LONG day.

Points awarded promptly.

Re: how to increment a number

Court Campbell — Fri, 20 Jul 2007 12:22:35 GMT

This may give you a good start

for x in `seq 1 100`
do
echo $x
done

Re: how to increment a number

Court Campbell — Fri, 20 Jul 2007 12:26:57 GMT

if you post more about what you are trying to accomplish with examples the community would be more than glad to help out.

Re: how to increment a number

Charles Holland — Fri, 20 Jul 2007 13:03:31 GMT

Court,
Thanks for the reply. Basically we would like a script to go out on our network and see which IP's exist.

Start with 1.2.3.X

Do loop begins here
Ping to see if 1.2.3.X exists >> /tmp/ping_results
test to see if X is = 256
if it is exit
if not increment X + 1 (and remain in loop)
end

Charles

Re: how to increment a number

Court Campbell — Fri, 20 Jul 2007 13:07:40 GMT

I am all for scripting, but I think an easier solution would be to download angry ip scanner on a windows machine and scan the whole subnet.

http://www.angryziber.com/ipscan/

Re: how to increment a number

Court Campbell — Fri, 20 Jul 2007 13:16:01 GMT

and you could always use nmap.

# nmap -sP 192.168.10.0/24

Re: how to increment a number

Charles Holland — Fri, 20 Jul 2007 13:16:23 GMT

With this script and an in_list file containing all the addresses to test it works fine

for I in `cat /root/in_list`
do
echo " Now testing address" $I
ping -c 2 $I >> /tmp/out_list
echo " "
done

I just don't want to create the entire in_list file.

I'll look at the link you provided and eval.

Charles

Re: how to increment a number

Charles Holland — Fri, 20 Jul 2007 13:19:27 GMT

what is nmap? I have looked on my HPUX boxes, my Linux box and tried it from a command window on my desktop.

Re: how to increment a number

Court Campbell — Fri, 20 Jul 2007 13:26:03 GMT

You would need to download nmap.

http://insecure.org/nmap/download.html

Re: how to increment a number

Charles Holland — Fri, 20 Jul 2007 13:42:11 GMT

I have tried the first link you provided. I tried running in from the web site and our AV would not allow it to run. I downloaded the .ZIP file and tried to extract it but the AV rejected it again.

We will look at the nmap product and see what it looks like.

Re: how to increment a number

Justin_99 — Fri, 20 Jul 2007 13:49:37 GMT

Generate the list pretty quick with this.
Just change the -le 150 to the last IP number i used 150 as example, and change xx.xx as well.

hou00us:~> i=0; while [ $i -le 150 ]; do printf "10.xx.xx.%d\n" $i ;i=`expr $i + 1`; done

10.xx.xx.0
10.xx.xx.1
10.xx.xx.2
10.xx.xx.3
10.xx.xx.4
10.xx.xx.5
10.xx.xx.6
10.xx.xx.7
10.xx.xx.8
10.xx.xx.9
10.xx.xx.10
<<>>
10.xx.xx.150

Re: how to increment a number

skt_skt — Fri, 20 Jul 2007 17:19:19 GMT

c=0;
command|while read a
do
((c=c+$a))
done

Re: how to increment a number

Mike Stroyan — Sat, 21 Jul 2007 20:38:24 GMT

Charles,
If you use bash shell you can use a for loop
very similar to C language syntax

for ((i=1; i<=100; i++))
do
echo $i
done

Re: how to increment a number

Yogeeraj_1 — Mon, 23 Jul 2007 00:18:17 GMT

hi Charles,

below an example of the nmap output:
=========================================
# nmap -sP 1.2.3.0/24
Starting nmap 3.70 ( http://www.insecure.org/nmap/ ) at 2007-07-23 09:14 MUT
Host 1.2.3.0 seems to be a subnet broadcast address (returned 10 extra pings). Note -- the actual IP also responded.
MAC Address: 00:0E:38:6F:FB:00 (Cisco Systems)
Host 1.2.3.1 appears to be up.
MAC Address: 00:03:6B:A7:0A:60 (Cisco Systems)
Host 1.2.3.2 appears to be up.
MAC Address: 00:17:E0:7E:98:96 (Unknown)
Host 1.2.3.3 appears to be up.
MAC Address: 00:0F:F7:16:1F:1E (Cisco Systems)
Host 1.2.3.4 appears to be up.
MAC Address: 00:0F:F7:16:1F:22 (Cisco Systems)
Host 1.2.3.5 appears to be up.
MAC Address: 00:11:85:F9:49:7A (Unknown)
Host 1.2.3.6 appears to be up.
MAC Address: 00:0E:38:50:97:80 (Cisco Systems)
Host 1.2.3.7 appears to be up.
MAC Address: 00:12:79:CF:55:ED (Unknown)
Host 1.2.3.8 appears to be up.
MAC Address: 00:12:79:CF:56:9F (Unknown)
Host 1.2.3.9 appears to be up.
MAC Address: 00:12:79:CF:55:ED (Unknown)
...
Host 1.2.3.251 appears to be up.
MAC Address: 00:16:17:5D:07:31 (Unknown)
Host 1.2.3.252 appears to be up.
MAC Address: 00:16:17:5C:EA:5C (Unknown)
Host 1.2.3.253 appears to be up.
MAC Address: 00:0C:29:74:2E:79 (VMware)
Host 1.2.3.254 appears to be up.
MAC Address: 00:0E:38:6F:FB:00 (Cisco Systems)
Host 1.2.3.255 seems to be a subnet broadcast address (returned 13 extra pings). Note -- the actual IP also responded.
MAC Address: 00:0E:38:6F:FB:00 (Cisco Systems)
Nmap run completed -- 256 IP addresses (167 hosts up) scanned in 6.706 seconds

=========================================

See if this is acceptable else we will have to work it out using scripts!

kind regards
yogeeraj

Re: how to increment a number

Charles Holland — Mon, 23 Jul 2007 05:49:38 GMT

situation resolved, Thanks to all who answered the call.

Thanks.

Re: how to increment a number

Charles Holland — Mon, 23 Jul 2007 05:52:36 GMT

Done.