#include<stdio.h>
#include<string.h>
#include<unistd.h>
#include<stdlib.h>
#include<sys/wait.h>

int main ()
{
    pid_t cpid;
    int c=0;
    char buf[25]="";
    char s[]="exit";
    char *newbuf[25]={0};
        int i=0;


do { printf("\nprompt>  ");
        gets(buf);

      newbuf[0]=strtok(buf," ");

     while(newbuf[i]!=NULL)
      {   i++;
         newbuf[i]=strtok(NULL," ");
      }

           i=0;
    do
    { if( buf[i]!=s[i])
       break;
      i++;
      if(i==3)
      { exit(0);}
    }while(i<4);


          cpid=fork();
        if(cpid<0)
        { printf("\nThe fork has failed\n");
        }
    /*  if(c=strncmp(buf,p,5)==0)
        {     strncpy(newbuf,buf,5);
           for(i=6;i<25;i++)
                    printf("%c",buf[i]);


        } */

          if(cpid==0) {
        { execvp(newbuf[0],newbuf);

        }
            }
           memset(buf,0,25);
                memset(newbuf,0,25);

    }while(1);

        return 0;
}