1. ► fcntl is used to get as well as set file attributes.
2. ► open call returns -1 on error.
3. ► File locks are mandatory on a GNU/Linux system.
4. ► Soft links reference the name of the file or directory.
5. ► Poll is much more efficient than select and should be the default choice.
6. ► sync does not need any arguments.
7. ► stat command reports total number of hard links to a file.
8. ► Only the superuser can view /var/log/messages.
9. ► Only a process started by the superuser can write to the logging daemon.
10. ► stat is a system call which is used to retrieve information about a file.
11. ► A file cannot be deleted unless all its hard links have been deleted.
12. ► Inode stands for: Interface Nodes.
13. ► ANSI C IO routines automatically deal with concurrency.
14. ► A file system only has a fixed number of inodes which are configured at each reboot.
15. ► It is possible to control the number of system calls in ANSI C IO libraries.
16. ► fdatasync and fsync do exactly the same thing.
17. ► lseek cannot absolutely position a file pointer.
18. ► access call returns a -1 if the permission check succeeds.
19. ► Directory routines in the file dirent.h have routines for recursively accessing directories.
20. ► ANSI C IO libraries are unbuffered.