file security

This article explores the `chmod` command in Linux, essential for managing file permissions and ensuring system security. It details both symbolic and numeric modes, offering practical examples to modify permissions effectively. Aimed at both new and experienced Linux users, the guide emphasizes mastering `chmod` for enhanced system management and security.

Learn how to use the `shred` command for secure file deletion on Unix and Linux systems, overwriting files with random data to prevent recovery. Understand limitations on journaling file systems and SSDs, and explore alternative data wiping methods for different storage technologies to ensure data privacy.