How can I assign values from text to variables?

Question

I have this text:

node1: connect command: ssh user@123.23.23.23 password: qcipunbnctza
node2: connect command: ssh user@123.23.23.44 password: ejrpnnwsczpa
node3: connect command: ssh user@123.23.23.66 password: pkrpxmyxnxuu

I need to save ip addresses and passwords to variables then pass it to script. How can I do in in efficent way? My script is:

#/bin/bash
declare -a IPS=($1 $2 $3)
CONFIG_FILE=inventory/sks-cluster/hosts.yaml python3 contrib/inventory_builder/inventory.py ${IPS[@]}
echo $4 > host1.txt
echo $5 > host2.txt
echo $6 > host3.txt
ssh-keyscan $1
ssh-keyscan $2
ssh-keyscan $3
sshpass -f host1.txt ssh-copy-id user@$1
sshpass -f host2.txt ssh-copy-id user@$2
sshpass -f host3.txt ssh-copy-id user@$3

Answer 1

Try something like this:

#!/bin/bash

export SSHPASS
awk -F'[@ ]' '{print $5, $6, $8}' hostlist.txt |
  while read -r username host SSHPASS ; do
    echo ssh-keyscan "$host"
    echo sshpass -e ssh-copy-id "$username@$host"
done

This uses an awk one-liner to extract the username, the hostname/IP address, and the password of each line from a file called hostlist.txt, with the output being piped into a while loop.

The while loop processes the output from awk and uses it with ssh-keyscan and sshpass (using the -e option instead of -f, so that it uses the environment variable $SSHPASS instead of a file) for each input line.

SSHPASS is exported to ensure that it is available in the environment when sshpass is run.

NOTE: I've used echo before ssh-keyscan and sshpass to make this a dry-run (and because testing it is faster if my system doesn't have to waste time trying to connect to those IP addresses with ssh-keyscan and ssh-pass+ssh-copy-id). Remove the echo from both lines when you're sure it's going to work as intended.

Answer 2

Here is a very naive way to do it.

If your script is called yourscript.sh and the data is in a file called nodes.txt

yourscript.sh  $(cat nodes.txt |  tr '@' ' ' | cut -f6 -d' '; cut -f7 -d' ' nodes.txt)