linux 中shell的简单写法

#include<stdio.h>#include<unistd.h>#include<stdlib.h>#include<sys/types.h>#include<sys/wait.h>int main(){char buf[128];while(1){printf("[test@my-host-name myshell]");fflush(stdout);sleep(3);ssize_t _s = read(0,buf,sizeof(buf) - 1);if(_s > 0){buf[_s-1] = '\0';}else{perror("read");return 1;}char* argv[32];argv[0] = buf;int i = 1;char *start = buf;while(*start){if(isspace(*start)){*start = '\0';start++;argv[i] = start;i++;// printf("i = %d\n",i);continue;}start++;}// printf("NULL : i = %d\n",i);argv[i] = NULL;pid_t id = fork();if(id < 0){perror("fork");}else if(id == 0){//childexecvp(argv[0],argv);exit(1);}else{int status = 0;pid_t ret = waitpid(id, &status,0);if(ret > 0 && WIFEXITED(status)){// printf("exit code:%d\n",WEXITSTATUS(status));}else{//fatherperror("waitpid");}}}return 0;}