Course 4 - Learning Linux Shell Scripting | Episode 7: Comprehensive Network Diagnostics and Remote Host Management | CyberCode Academy

In this lesson, you’ll learn about:

Network connectivity & diagnostics: using ping to verify reachability and measure RTT (use -c to limit packets, check exit status), and traceroute to map hops. Techniques for discovering live hosts via parallel ping scripts or fping for fast network sweeps.
Secure remote access & automation (SSH): running remote commands securely, enabling compression (-C), X11 forwarding for GUI apps, and setting up passwordless login with ssh-keygen + authorized_keys for automated scripts and non-interactive sessions.
File transfer methods: classic FTP/lftp scripting, and secure alternatives over SSH — SCP, SFTP, and rsync (efficient delta transfers and remote backups). Best practices for automating transfers and preserving permissions.
Advanced network control (port forwarding & remoting): local and remote port forwarding examples, non-interactive/daemonized forwards, reverse tunnels to expose non-public machines, and mounting remote filesystems with SSHFS for local access to remote drives.
Network analysis & custom communication: listing open ports and connections (lsof -i, netstat -tnp), inspecting services, and building arbitrary TCP/UDP sockets with netcat (nc) for ad-hoc listeners, file transfers, or simple debugging shells.
Practical tips & safety: prefer encrypted channels (SSH/SFTP/rsync over SSH), restrict forwarded ports and keys to minimal scope, monitor open ports regularly, and test automation on controlled hosts before production use.

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Course 4 - Learning Linux Shell Scripting | Episode 7: Comprehensive Network Diagnostics and Remote Host Management