shell 메뉴얼

• bash manual (For every point, if you have any doubt take bash as a reference.)
• https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18 (shell command language)
• https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_10 (shell grammar)

참고 자료

• https://velog.io/@hidaehyunlee/minishell-1.-과제소개-및-선행지식
• https://jaeseokim.dev/Etc/how_to_parse_cmd_in_bash_1/
• https://rrddo.tistory.com/m/210
• https://epicarts.tistory.com/m/163 (트리구조 파싱)
• https://dev.to/oyagci/generating-a-parse-tree-from-a-shell-grammar-f1 (parse tree)
• https://stackoverflow.com/questions/39199299/what-is-the-essential-difference-between-compound-command-and-normal-command-in (compound cmd 와 simple cmd 의 차이)
• https://zidarn87.tistory.com/351 시그널

메뉴얼 에서 참고할 점

• tokenizer할 때의 기준 (token은 word나 operator)

• 실제 bash에서 명령어가 실행되는 과정

• 종료시 반환되는 exit status

• redirection