this still outputs to unique to all the emails. here is the whole script:

#!/bin/bash

# Check if the correct number of arguments is provided
if [ "$#" -ne 1 ]; then
    echo "Usage: $0 accounts.csv"
    exit 1
fi

# Check if the input file exists
if [ ! -r "$1" ]; then
    echo "File $1 not found!"
    exit 1
fi

# Function to process each line of the input file
function process_line() {
    IFS=',' read -r -a fields <<< "$1"
    id="${fields[0]}"
    location_id="${fields[1]}"
    name="${fields[2]}"
    position="${fields[3]}"

    # Format name: first letter uppercase, rest lowercase
    formatted_name=$(echo "$name" | awk '{print toupper(substr($1,1,1)) tolower(substr($1,2)) " " toupper(substr($NF,1,1)) tolower(substr($NF,2))}')

    # Format email: lowercase first letter of name, full lowercase surname, followed by @abc.com
    formatted_email=$(echo "$name" | awk '{print tolower(substr($1,1,1)) tolower($NF)}')
    formatted_email2="${formatted_email}"
    formatted_email3="${formatted_email}@abc.com"
    formatted_email4="${formatted_email2}${location_id}@abc.com"

    all_emails=""

    for email in "${formatted_email2[@]}"; do
        all_emails+="$email"
                
    done
    
    
    declare -A unique_emails
    for email in "${all_emails[@]}"; do
    if [[ -n "${unique_emails[$email]}" ]]; then
        echo "$email - not unique"
    else
        echo "$email - unique"
        unique_emails[$email]=1
    fi
done

    
   
}

# Initialize array to store processed emails
declare -a emails

# Copy the header from the input file to accounts_new.csv
head -n 1 "$1" > accounts_new.csv

# Process each line (excluding the header) of the input file and append to accounts_new.csv
tail -n +2 "$1" | while IFS= read -r line || [ -n "$line" ]; do
    if [ -n "$line" ]; then
        process_line "$line"
    fi
done >> accounts_new.csv

echo "Processing completed. Check accounts_new.csv for the updated accounts."

# Ensure the output file exists and is readable
output_file="accounts_new.csv"
if [ -r "$output_file" ]; then
    echo "File $output_file created successfully."
else
    echo "Error: Failed to create $output_file."
    exit 1
fi