Simple UNIX command line interpreter based on the DASH shell. It understands basic UNIX commands from the standard input or file. It's not necessary to type the complete path of an executable file, since the shell can find it. It also and has a built-in exit.
- Displays a prompt and waits for the user to type a command. A command line always end with a new line.
- The prompt is displayed again each time a command has been executed.
- The command lines are simple, no semicolons, no pipes, no redirections or any other advanced features.
- The command lines can have arguments.
- It handles the path of an executable and doesn't require typing it.
- If an executable cannot be found, print an error message and display the prompt again.
- Handles errors.
- It handles the "end of file" condition (Ctrl+D)
- Has an exit built-in, that exits the shell.
- Added env built-in that prints the current environment.
A prompt is displayed to move the user to write a command to be interpreted. It searches for the PATH in the environment variable and tthen for the specific absolute path inside it. Then it executes the file in a child process to protect the current process.
Miguel Antonio Cortés Muñoz, Mariana Plazas