cw_shell.c

linux——shell nachos 的课程设计 第一个

#include<stdio.h>
#include<unistd.h>
#include<stdlib.h>
#include<string.h>

int main()
{
 int status,size; int pid;
 system("clear");
 char *argv[]={"ls","-l",NULL};
 char *t="quit";
 while(1)
{
 system("echo -n '>'");
 

 argv[0]=(char *)malloc(10);
 scanf("%s",argv[0]);
 
 size=strlen(argv[0]);
 printf("%d",size);
 argv[0][size+1]='\0';
   
 
 if (strcmp(argv[0],t)==0) exit(0);
 
 argv[1]=(char *)malloc(10);
 scanf("%s",argv[1]);
 
 size=strlen(argv[1]);
 printf("%d",size);
 argv[1][size+1]='\0';

// if (strcmp(argv[0],t)==0) exit(0);

 if((pid=fork())==-1)
  {
	printf(" Fork error\n");
	exit(-1);
  }
 else if (pid>0) /*parent process*/
  {
	wait(&status);
	printf("\nCommand OK\n");
	//printf("\n Child returned:%d\n",status);
  }
 else
  {
     printf("break child process");
     execvp(argv[0] ,&argv[0]);
  }
}

}