Shell scripting question

himitsu · 09-02-2009, 12:00 AM

HI,

I am trying to get a ping request on all live host.

#!/bin/bash
# Ping all IP numbers in 192.168.9.0/24.*
# Record the host names of those that respond
rm live-hosts
for(( n=0 ; $n < 255 ; n=$n+1 ))

do

ip=192.168.9.0/24.$n
if true #ping -c 1 -w 1 $ip
then
host=‘host $ip‘
echo $host >> live-hosts.txt

fi
done

When I run this script I get line 12 no file or directory. What am I doing wrong here. Any help would be great thanks

JulianTosh · 09-02-2009, 12:29 AM

use the ` instead of the '

Tinkster · 09-02-2009, 01:53 AM

On a second note:

192.168.9.0/24.1 is not a valid IP address. Get rid of
the range if you're pinging individual hosts.

Code:

ip=192.168.9.$n

Cheers,
Tink

SwaJime · 09-02-2009, 01:53 AM

Quote:

Originally Posted by himitsu

HI,

I am trying to get a ping request on all live host.

#!/bin/bash
# Ping all IP numbers in 192.168.9.0/24.*
...

Why don't you use #ping -b 192.168.9.0; ?
The command "ping 192.168.9.0/24.1" does not work on my system. I've never seen that syntax before.

JulianTosh · 09-02-2009, 02:25 AM

Quote:

Originally Posted by Admiral Beotch

use the ` instead of the '

lol. woops. sleep. need sleep. sorry.

himitsu · 09-02-2009, 06:08 PM

Hi,
Thanks for the help

When I run the shell I get the following
ping: unknown host 192.168.8.1

Any ideals

Thanks

Quote:

Originally Posted by Tinkster

On a second note:

192.168.9.0/24.1 is not a valid IP address. Get rid of
the range if you're pinging individual hosts.

Code:

ip=192.168.9.$n

Cheers,
Tink

Tinkster · 09-02-2009, 06:26 PM

A wild guess. When I copied your script from the browser there
was a load of "weird" characters where your ' were ...

Is it possible that you have some unicode whitespace tacked
on there somewhere?

Cheers,
Tink

himitsu · 09-02-2009, 08:28 PM

HI,

I do thank you for the help

This seems to work.

#!/bin/bash
for ((n=0 ; n < 255 ; n+=1))
do

ip=192.168.9.$n
if ping -c 1 -w 1 $ip

then
host=&ip
echo $host >> live-host.txt
fi
done

Is this one way to determine if a host is up by pinging?

Quote:

Originally Posted by Tinkster

A wild guess. When I copied your script from the browser there
was a load of "weird" characters where your ' were ...

Is it possible that you have some unicode whitespace tacked
on there somewhere?

Cheers,
Tink

Tinkster · 09-02-2009, 08:46 PM

It certainly is ... it might be quicker/easier to use nmap, though

Code:

nmap -sP 192.168.9.0/24

himitsu · 09-02-2009, 08:59 PM

Thanks for the help

I like to hard route before the easy one.