一个简单的shell

#include<stdio.h>
#include<string.h>
#include<unistd.h>
#include<stdlib.h>
#define NUM 16
#define MAX 1024
int main()
{
  char *myargv[NUM];
  char cmd[MAX];
  while(1){
  printf("[shell@localhost lianxi]:");
  fgets(cmd,sizeof(cmd),stdin);
  cmd[strlen(cmd)-1]='\0';
  int i=0;
  myargv[i++]=strtok(cmd," ");
  char *ret=NULL;
  while(ret = strtok(NULL," "))
  {
    myargv[i++]=ret;
  }
  myargv[i]=NULL;
  pid_t id =fork();
  if(id==0)
  {
    execvp(myargv[0],myargv);
  }//child
  else
  {
    waitpid(id,NULL,0);
  }//parent
  }
  //int j=0;
 //for(;j<i;j++)
  //{
  //  printf("%s\n",myargv[j]);
 // }

  return 0;
}