Starting with ssh-ing in and some simple commands like: ls, uptime, free, df -h, uname -a. Extensions on doing passwordless login with public keys and and an ssh config file.
Basic navigation, the "man" pages, file hierarchy
Working with sudo, uptime, timezones, changing your hostname
Using 'apt' to find and install sotware. Use of mc to explore the filesystem. Looking at the contents of: /etc/passwd, /etc/ssh/sshd_config and /var/log/auth.log
Using more, less and navigating in these. Dotfiles, history, tab completion, and using the nano txt editor
Learning vim, the minimal knowledge, but also via vimtutor
Installing Apache2, stopping and starting, altering the content, reading logs
Hands-on with text tools like grep, cat, more, less, cut, awk and tail - and piping of course. (and a wave to awk and sed)
Looking at open ports with with ss, and a nod to netstat, install nmap and test. Install ufw, set up, enable and test etc. Discuss security resonsibilities as the sysadmin.
Covering cron, at, and systemd timers
Finding things with: locate, find, grep, which
SFTP, the technology, clients, and copying up and down
Permissions, users, groups, (ACLS and SELinux in the Extension)
Using adduser, visudo to setup up a restricted "helper" to manage our host
Repositories in more detail, how to enable "Multiverse", the role of PPAs in Ubuntu, enabling and installing from them
Understanding and using tar and gzip
Installing from source. Discussion, using wget to get a tarball, tar to extract and then configure, make and install. Discussion of security, maintenance issues.
Log management and rotation, logrotate
Inodes, hard links symlinks and stat
Understanding how scripting work in Linux, the shebang, permissons and $PATH. A couple of simple sample scripts based on the filtering of logs we've been doing. Resources to explore further.