How do I print certain text for a specific IP address from a file and repeat the process for multiple texts and IP addresses?

Question

I'm automating the process of customizing multiple boxes/devices. The following bash script reads IP address from a file called device_ips.txt -> connects to one device -> runs the adb commands -> disconnects the device -> connect to next IP address and repeats the process.

#!/bin/bash

while true; do
  ip_file="device_ips.txt"
  if [ ! -f "$ip_file" ]; then
    echo "Error: $ip_file not found."
    exit 1
  fi

  # Read the IP addresses from the file into an array
  mapfile -t device_ips < "$ip_file"

  for device_ip in "${device_ips[@]}"; do
    device_ip=$(echo "$device_ip" | tr -d '\r')  # Remove any Windows-style carriage return characters

    if [ -z "$device_ip" ]; then
      echo "Error: No IP address found in the file."
      exit 1
    fi

    adb disconnect

    adb connect "$device_ip"

    connected=$(adb devices | grep "$device_ip" | awk '{print $2}')
    if [ "$connected" != "device" ]; then
      echo "Error: Connection to $device_ip failed."
      continue
    fi

    # Commands to be executed
    adb root
    adb remount
    adb install...
    # rest of adb commands...

    #LOGIN
    email_file="emails.txt"
    mapfile -t email < "$email_file"
    while IFS= read -r email; do
      email=$(echo "$email" | tr -d '\r')
      adb shell input tap 886 337 # Taps on empty textbox where email has to typed
      for ((i=0; i<${#email}; i++)); do
        adb shell input text "${email:i:1}" # types email
      done
      adb shell input tap 930 549 # login
    done < "$email_file"

    wait

  done

done

device_ips.txt file contains IP addresses in this format:

192.168.0.123
192.168.0.132
192.168.0.146

It works well in picking up the next IP address from the file and customizing the devices one by one. The issue I'm facing is with the Login process (below #LOGIN). The code is supposed to pick up emails one by one the same way it does for IP addresses but it keeps repeating the first email (id_1@email.com) on all devices and doesn't move to second email or to third email.

emails.txt contains the email IDs:

id_1@email.com
id_2@email.com
id_3@email.com

I tried changing third line below #LOGIN which was while IFS= read -r email; do to for email in "${email[@]}"; do and it prints all emails together in textbox like: id_1@email.comid_2@email.comid_3@email.com and repeats the same thing on all the devices.

What I want is it types id_1@email.com on IP address 192.168.0.123 then id_2@email.com on 192.168.0.132 and so on.

Answer 1

Read both files into arrays, and then use a for loop to iterate over array indexes so that you can retrieve the email address from the same index as the ip address you're currently processing. Something like:

ip_file="device_ips.txt"
email_file="emails.txt"
mapfile -t device_ips < "$ip_file"
mapfile -t email_addresses < "$email_file"

for (( i=0; i<${#device_ips[@]}; i++ )); do
  echo "device ip: ${device_ips[i]}"
  echo "email: ${email_addresses[i]}"
  echo "---"
done

Running this code will produce output like:

device ip: 192.168.0.123
email: id_1@email.com
---
device ip: 192.168.0.132
email: id_2@email.com
---
device ip: 192.168.0.146
email: id_3@email.com
---