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Ping sweep with Bash script in Linux

Ping is a good tool to easily check or troubleshoot a system whether it is online or not.

Provided the system or device is allowed to reply to any ICMP request.

A simple Bash script below shows how to ping a Class C subnet. Replace the IP Address range below if you want to use it depending on the IP Address set on your network.

It also illustrates how to make use of while loop, increment a variable counter, and use a variable to substitute as part of the whole command in Bash.

 #======================

#!/bin/sh

i=0

while [ $i -ne 255 ]  # initialize the counter don't exit until 255 counter is reached

do

        i=$(($i+1))  #increment the variable counter by adding 1 to it

        echo "$i"    # just show the counter as it is incremented

        ping -c2 192.168.0.$i  # ping the IP Address twice $i will be substituted with the current number in the loop

done

# =======================

That's it, it will ping the IP Address twice. If the result shows 100% packet loss then the system could be offline or not allowed to reply to ICMP request.

However, if the reply shows 64 bytes from IP.Address then the system is online.

The script can be expanded to send an email if the IP Address if offline or just log the reply of the IP Address to be reviewed later on.

Till next time. Stay safe! and keep things up! 

Do ASAP, Always Say A Prayer...

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