Sstrhsrtj

I have this script of nmap which retrieves only alive IP devices from the network.

nmap -sP 192.168.1.0/24 | awk '/is up/ {print up}; {gsub (/(|)/,""); up = $NF}'

I want to get the result IP addresses from nmap to loop through the below command, as far as I understand multiple results may not be having any return value from nmap.

echo "# This script checks if a remote device is alive"

read va * This is suppose to receive the IP address one by one

echo "Checking Device "$va

if [ $(nc -z "$va" 22; echo $?) -eq 0 ]; then

echo $va" is Online !"

else

echo "Cannot proceed with remote connection device "$va" is Offline !"

fi

You can check for opened tcp port 22 with nmap also.

nmap -p 22 192.168.1.0/24 -oG - | grep -oP "Host: K[^ ]+(?=.* 22/open/tcp.*)"

Welcome to unix.stackexchange !

xargs is your friend here.

But first some changes to your script:

$ cat test.sh

#!/bin/bash

echo "# This script checks if a remote device is alive"

va=$1 # passing it as an argument is the right thing to do here

echo "Checking Device "$va

if [ $(nc -z "$va" 22; echo $?) -eq 0 ]; then

    echo $va" is Online !"

else

    echo "Cannot proceed with remote connection device "$va" is Offline !"

fi

And now the xargs magic (% will be replaced by each address at each call) :

$ nmap -sP 172.20.10.1-2 | awk '/is up/ {print up}; {gsub (/(|)/,""); up = $NF}' |xargs -I % bash test.sh %

# This script checks if a remote device is alive

Checking Device 172.20.10.1

Cannot proceed with remote connection device 172.20.10.1 is Offline !

# This script checks if a remote device is alive

Checking Device 172.20.10.2

Connection to 172.20.10.2 port 22 [tcp/ssh] succeeded!

172.20.10.2 is Online !

You can also replace bash test.sh % with echo ">>>%<<<" in order to experiment what happens then.

However, Ipor Sircer answer is shorter to implement.

But as always with Unix: there are plenty of solutions for every problem