Automated Student Data Anonymization Pipeline

Create a robust Bash script that securely anonymizes student personal identification data across multiple CSV and JSON files from a school's student management system. The script must irreversibly hash sensitive fields like names and student IDs, preserve statistical integrity, and generate comprehensive audit logs. Include error handling for file permissions, validate input data structures, and ensure GDPR/FERPA compliance. The solution should support incremental processing for large datasets and provide optional encryption for processed files.