Learning outcomes

• Get familiar with the system API
• Get to know the many functionalities of the shell
• Understand how to customize or write simple scripts
• Know how to create and control system processes
• Understand the key concepts of lexing and parsing

The features implementing

• globbing ★✩✩✩
• path expansions (tilde expansions, parameter expansions) ★✩✩✩
• pipes & the redirections >, <, >> and << ★★★✩
• handling the exit status of commands ★✩✩✩
• command substitution with the backquotes ★★✩✩
• logical operators && and || ★★✩✩
• signals handling ★★✩✩
• subshells with () ★★✩✩
• quoting (quotes & escape characters) ★✩✩✩
• command-line edition with the curses module (being able to move the cursor with arrows left & right to edit some part of the line, key combination of your choice to go at the beginning & at the end of the line, arrows up & down to move inside the history...) ★★★✩
• the command history with the builtins history and ! ★★✩✩
• dynamic command completion ★★✩✩