Top 50 Linux Commands for Securing a Linux Server

Here are the top 50 Linux commands for securing a Linux server:

  1. passwd: Change the password for a user account.
  2. su: Switch to another user account.
  3. sudo: This command allows users to run programs with the security privileges of another user (normally the superuser, or root).
  4. ufw: Set up a firewall to control incoming and outgoing traffic.
  5. fail2ban: Protect against brute-force attacks by blocking IP addresses.
  6. ssh: Securely connect to the server using SSH protocol.
  7. ssh-keygen: Generate SSH key pairs for secure authentication.
  8. iptables: Configure the firewall rules on a Linux server.
  9. chmod: This command changes the permissions of a file or directory. It’s essential for setting the correct permissions to prevent unauthorized access.
  10. chown: Change the owner of files and directories.
  11. chgrp: Change the group ownership of files and directories.
  12. find: Search for files and directories on the system.
  13. grep: Search for patterns in files or command output.
  14. ps: Display currently running processes.
  15. netstat: Show network connections and listening ports.
  16. top: Monitor system resources and running processes.
  17. service: Start, stop, or restart system services.
  18. systemctl: Control system services and check their status.
  19. sshd_config: Edit the SSH server configuration file.
  20. hosts.deny: Specify which IP addresses are denied access.
  21. hosts.allow: Specify which IP addresses are allowed access.
  22. logrotate: Manage log files and rotate them periodically.
  23. securetty: List users and terminals authorized for login.
  24. nmap: Scan for open ports and discover network services.
  25. rkhunter: Detect and report rootkit and malware infections.
  26. tripwire: Monitor file and directory integrity.
  27. lynis: Security auditing and hardening tool.
  28. openssl: Perform various cryptographic operations.
  29. tcpdump: Capture network packets for analysis.
  30. faillog: Display failed login attempts.
  31. history: Show command history for each user.
  32. ulimit: Set resource limits for processes.
  33. sysctl: Modify kernel parameters at runtime.
  34. apt-get: Package management tool for Debian-based systems.
  35. yum: Package management tool for RPM-based systems.
  36. lsblk: List information about block devices.
  37. ifconfig: Configure and display network interfaces.
  38. ping: Test network connectivity to a remote server.
  39. traceroute: Trace the route packets take to a destination.
  40. ss: Display socket statistics.
  41. alias: Create custom command shortcuts.
  42. setfacl: Set Access Control Lists for files and directories.
  43. openssl: Generate and manage SSL/TLS certificates.
  44. sshfs: Mount remote directories over SSH.
  45. ntp: Synchronize system time with NTP servers.
  46. ausearch: Search audit logs for security events.
  47. sysstat: Collect and analyze system performance data.
  48. passwdqc: Password quality checking and enforcement.
  49. logwatch: Analyze and summarize system logs.
  50. aide: File and directory integrity checker.

These commands will help you enhance the security of your Linux server.

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