Chap 8. Process
Processes and Programs Studying sh
* process (동적) / program (정적)
* kernel -> allocate program at memory
* shell -> control process, run program
* execvp(program name, arglist) -> run process
* fork() -> 프로세스 하나 추가, wait(NULL) -> 대기하기
* shell PR의 구조 - fork~execvp~wait
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