Administration

Table of Contents

34. Security in Linux

34.1. Masquerading and Firewalls

34.2. SSH: Secure Network Operations

34.3. Encrypting Partitions and Files

34.4. Security and Confidentiality

35. Access Control Lists in Linux

35.1. Advantages of ACLs

35.2. Definitions

35.3. Handling ACLs

35.4. ACL Support in Applications

35.5. For More Information

36. System Monitoring Utilities

36.1. List of Open Files: lsof

36.2. User Accessing Files: fuser

36.3. File Properties: stat

36.4. USB Devices: lsusb

36.5. Information about a SCSI Device: scsiinfo

36.6. Processes: top

36.7. Process List: ps

36.8. Process Tree: pstree

36.9. Who Is Doing What: w

36.10. Memory Usage: free

36.11. Kernel Ring Buffer: dmesg

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

36.13. The /proc File System

36.14. vmstat, iostat, and mpstat

36.15. procinfo

36.16. PCI Resources: lspci

36.17. System Calls of a Program Run: strace

36.18. Library Calls of a Program Run: ltrace

36.19. Specifying the Required Library: ldd

36.20. Additional Information about ELF Binaries

36.21. Interprocess Communication: ipcs

36.22. Time Measurement with time