Mastering Linux Fundamentals: From Zero to Hero

Explore the Linux file system hierarchy from the root, navigating key directories like /home, /etc, /var, /bin, /usr, /tmp, /dev, and /proc to understand file storage, configuration, and dynamic data.

Navigate the Linux file system with pwd, ls, and cd to move. Explore permissions, absolute versus relative paths, and show hidden files with ls -a.

Master Linux file management with touch to create files, mkdir -p for directories, and rm -i for safety. Copy with cp, move or rename with mv, and view with ls/ll.

Master how to view file contents with cat, less, more, tail, and head, including when to use each for large files, short texts, and logs.

Explore Linux file permissions, security, and access control; learn to view and modify permissions with ls -l, chmod, and chown, including symbolic and numeric modes.

Explore editing files in Linux by using nano, vim, and gedit to create, edit, and save text, while learning mode changes, shortcuts, and editor selection for different workflows.

Master grep and find to search and manipulate files in linux, using regular expressions, case-insensitive options, recursive searches, and file discovery by name, size, or date.

Master Linux file compression and decompression using tar, gzip, zip, and unzip to bundle, compress, and recover files for efficient backups, transfers, and data organization.

Master foundational linux networking concepts such as subnetting, DNS, firewalls, routing, and ports, and learn to use iptables, ufw, netstat, and ss to manage and troubleshoot connectivity.

Master essential Linux networking commands, including ifconfig, IP route show, ping, traceroute, netstat, curl, and wget, to configure interfaces, test connectivity, trace routes, and download data.

Master the secure shell, SSH, to connect to remote servers using a client–server model, authenticate with passwords or key pairs, and securely manage and troubleshoot Linux systems.

Configure Linux firewalls using UFW and iptables to protect systems, enable UFW, allow SSH, block port 8083, and persist rules after reboot.

View, manage, and terminate Linux processes using ps, top, kill, and htop, with pid lookup, real-time monitoring, and safe termination practices.

Learn to automate Linux tasks with cron and crontab, using the five-field syntax (minute, hour, day of month, month, day of week) and absolute paths.

Monitor disk usage on a Linux system with df and du to check space, identify large files and directories, and keep storage healthy with human-readable outputs and inode awareness.

Explore Linux system logs to diagnose issues, monitor system health, and secure your environment. Use journalctl for filtered, real-time viewing and navigate /var/log files like auth.log, messages, and apt logs.

Explore the theory of bash scripting, tracing its history from Unix and the Bourne shell to modern bash, and learn how scripts automate tasks and support devops workflows.

Learn to write and run shell scripts using the shebang, variables, and conditionals. Master loops (for and while) with input, echo, and string comparisons.

Complete the project by developing a shell script to monitor root disk usage on Linux, compare against an 80% threshold, and append results to a log file with a timestamp.

execute a final project solution that creates a disk usage monitor script, logs usage with timestamps, and triggers alerts when usage exceeds an 80 percent threshold, scheduled via crontab.

Mastering Linux fundamentals guides you from installing a distro in a VM to mastering the file system, core commands like ls and cp, editors, networking, and system tasks.