chmod, find, locate, grep & sed

Short summary

Linux tutorial covering chmod permissions (symbolic and numeric syntax), user management via /etc/passwd, and file-search tools: find for live filesystem scanning with flexibility, locate for faster database-backed searches. Includes practical examples for access control, permission audits, and security. Essential reference for DevOps and system administration.

• •chmod: both symbolic (u/g/o +/- rwx) and numeric (755, 644) permission models with clear examples
• •find scans live filesystem—more flexible; locate uses pre-built database—much faster
• •Real-world server ops use cases: permission audits, temporary user access, disk investigation, security scanning

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