이 프로그램은 Intel Mac을 기준으로 작성되었습니다. (M1 Mac 가능)

minishell

1. make 를 이용해 컴파일합니다.
2. minishell을 실행합니다.

bash를 참고하여 최대한 bash와 비슷하게 만들어 보았습니다.

구현사항

• Display a prompt when waiting for a new command.

• Have a working history.

• Search and launch the right executable (based on the PATH variable or using a relative or an absolute path).

• Avoid using more than one global variable to indicate a received signal. Consider the implications: this approach ensures that your signal handler will not access your main data structures.

• Not interpret unclosed quotes or special characters which are not required by the subject such as \ (backslash) or ; (semicolon).

• Handle ’ (single quote) which should prevent the shell from interpreting the metacharacters in the quoted sequence.

• Handle " (double quote) which should prevent the shell from interpreting the metacharacters in the quoted sequence except for $ (dollar sign).

• Implement redirections:

  • "<" should redirect input.
  • ">" should redirect output.
  • "<<" should be given a delimiter, then read the input until a line containing the delimiter is seen. However, it doesn’t have to update the history!
  • ">>" should redirect output in append mode

• Implement pipes (| character). The output of each command in the pipeline is connected to the input of the next command via a pipe.

• Handle environment variables ($ followed by a sequence of characters) which should expand to their values.

• Handle $? which should expand to the exit status of the most recently executed foreground pipeline.

• Handle ctrl-C, ctrl-D and ctrl-\ which should behave like in bash.

• In interactive mode:

  • ctrl-C displays a new prompt on a new line.
  • ctrl-D exits the shell.
  • ctrl-\ does nothing.

• Your shell must implement the following builtins:

  • echo with option -n
  • cd with only a relative or absolute path
  • pwd with no options
  • export with no options
  • unset with no options
  • env with no options or arguments
  • exit with no options