My own shell written in C which implements a command line interface similar to well-known shells, such as bash.

The program:

1. Prints an interactive input prompt
2. Parses command line input into semantic tokens
3. Implements parameter expansion
   • Shell special parameters $$, $?, and $!
   • Tilde (~) expansion
4. Implements two shell built-in commands: exit and cd
5. Executes non-built-in commands using the the appropriate EXEC(3) function.
6. Implements redirection operators ‘<’ and ‘>’
7. Implements the ‘&’ operator to run commands in the background
8. Implements custom behavior for SIGINT and SIGTSTP signals

1. Input
2. Word splitting
3. Expansion
4. Parsing
5. Execution
6. Waiting