mjhjmtu

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 (/('

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 (/(' |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