4.1. Introduction4.2. stat, fstat, fstatat, and lstat Functions4.3. File Types4.4. Set-User-ID and Set-Group-ID4.5. File Access Permissions4.6. Ownership of New Files and Directories4.7. access and faccessat Functions4.8. umask Function4.9. chmod, fchmod, and fchmodat Functions4.10. Sticky Bit4.11. chown, fchown, fchownat, and lchown Functions4.12. File Size4.13. File Truncation4.14. File Systems4.15. link, linkat, unlink, unlinkat, and remove Functions4.16. rename and renameat Functions4.17. Symbolic Links4.18. Creating and Reading Symbolic Links4.19. File Times4.20. futimens, utimensat, and utimes Functions4.21. mkdir, mkdirat, and rmdir Functions4.22. Reading Directories4.23. chdir, fchdir, and getcwd Functions4.24. Device Special Files4.25. Summary of File Access Permission Bits4.26. SummaryExercises