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Navigating directories, listing files, understanding paths, and fundamental filesystem commands.

Creating, copying, moving, deleting, and inspecting files and directories.

grep, sed, awk, sort, uniq, cut, tr, and pipelines for text manipulation.

chmod, chown, umask, sudo, user management, groups, and file permission model.

ps, top, htop, kill, jobs, signals, background processes, and system resource inspection.

curl, wget, ssh, netstat, ss, ping, traceroute, nc, and network diagnostics.

Variables, conditionals, loops, functions, exit codes, and writing bash scripts.

Environment variables, PATH, shell config files, apt, brew, npm, pip, and package managers.