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Write a UNIX command line interpreter.
Usage: simple_shell Your Shell should:
Display a prompt and wait for the user to type a command. A command line always ends 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 are made only of one word. No arguments will be passed to programs. If an executable cannot be found, print an error message and display the prompt again. Handle errors. You have to handle the “end of file” condition (Ctrl+D) You don’t have to:
use the PATH implement built-ins handle special characters : ", ', `, , *, &, # be able to move the cursor handle commands with arguments execve will be the core part of your Shell, don’t forget to pass the environ to it…
Simple shell 0.1 +
Handle command lines with arguments
Simple shell 0.2 +
Handle the PATH fork must not be called if the command doesn’t exist
Simple shell 0.3 +
Implement the exit built-in, that exits the shell Usage: exit You don’t have to handle any argument to the built-in exit
imple shell 0.4 +
Implement the env built-in, that prints the current environment