- Shells and Shell scripting: Customize and use the shell environment; Customize or write simple scripts.- Customize and use the shell environment;- Customize or write simple scripts.- User interfaces and desktops: Install and configure X11; Graphical Desktops; Accessibility.- Install and configure X11;- Graphical Desktops;- Accessibility.- Administrative Tasks: Manage user and group accounts and related system files; Automate system administration tasks by scheduling jobs; Localisation and internationalization.- Manage user and group accounts and related system files;- Automate system administration tasks by scheduling jobs;- Localisation and internationalization.- Essential System Services: Maintain system time; System logging; Mail Transfer Agent (MTA) basics; Manage printers and printing.- Maintain system time;- System logging;- Mail Transfer Agent (MTA) basics;- Manage printers and printing.- Network Fundamentals: Persistent network configuration; Basic network troubleshooting; Configure client side DNS.- Persistent network configuration;- Basic network troubleshooting;- Configure client side DNS.- Security: Perform security administration tasks Setup host security Securing data with encryption- Perform security administration tasks- Setup host security- Securing data with encryption