#!/bin/bash

# This script identifies duplicate user names but performs no remediation.
# It is designed to be non-destructive and requires manual administrator intervention.

# Find duplicate user names by checking the first field of /etc/passwd.
# The output is stored in a variable.
duplicates=$(cut -d: -f1 /etc/passwd | sort | uniq -d)

# If the 'duplicates' variable is not empty, it means duplicates were found.
if [ -n "$duplicates" ]; then
    # Print a warning message to standard error (stderr).
    {
        echo "WARNING: Duplicate user names found. Manual remediation is required."
        echo "The following user names are duplicated in /etc/passwd:"
        echo "$duplicates"
    } >&2
fi

# This script must always indicate failure to trigger manual review,
# as automatic remediation is not supported for this destructive action.
# The 'false' command exits with a non-zero status code.
false