Linux Basics

Master the Linux command line: bash and zsh fundamentals, pipes, redirection, process substitution, shell scripting basics, and essential one-liners for sovereign server management.

Linux file system navigation and permission management: chmod, chown, umask, find, ln, directory structure, disk usage with df/du, and inode fundamentals.

Sovereign Linux user management: useradd, usermod, userdel, group management, sudo configuration, PAM, and SSH key-based authentication with least-privilege principles.

Manage Linux processes and services: systemd unit files, journalctl log analysis, cron and anacron scheduling, ps/htop/kill, and service dependency management.

Linux networking from the command line: ip, ss, netstat, ping, traceroute, DNS resolution with dig, nftables basics, and network interface configuration on Ubuntu.

Linux package management across distributions: apt and dpkg on Debian/Ubuntu, dnf on Fedora/RHEL, snap vs apt trade-offs, PPA management, and unattended-upgrades.