Administration

Table of Contents

23. Security in Linux

23.1. Masquerading and Firewalls

23.2. SSH: Secure Network Operations

23.3. Encrypting Partitions and Files

23.4. Security and Confidentiality

24. Access Control Lists in Linux

24.1. Advantages of ACLs

24.2. Definitions

24.3. Handling ACLs

24.4. ACL Support in Applications

24.5. For More Information

25. System Monitoring Utilities

25.1. List of Open Files: lsof

25.2. User Accessing Files: fuser

25.3. File Properties: stat

25.4. USB Devices: lsusb

25.5. Information about a SCSI Device: scsiinfo

25.6. Processes: top

25.7. Process List: ps

25.8. Process Tree: pstree

25.9. Who Is Doing What: w

25.10. Memory Usage: free

25.11. Kernel Ring Buffer: dmesg

25.12. File Systems and Their Usage: mount, df, and du

25.13. The /proc File System

25.14. vmstat, iostat, and mpstat

25.15. procinfo

25.16. PCI Resources: lspci

25.17. System Calls of a Program Run: strace

25.18. Library Calls of a Program Run: ltrace

25.19. Specifying the Required Library: ldd

25.20. Additional Information about ELF Binaries

25.21. Interprocess Communication: ipcs

25.22. Time Measurement with time