intr.c

#include<unistd.h>
#include<fcntl.h>
#include<string.h>
#include<stdio.h>
int main(int argc, char** argv){
  char line[1000];
  char dollar = '$';
  char* args[100];
  char* crr;
  char* delim = " ";
  while(1){
     write(1, &dollar, sizeof(dollar));
     //read(0, line, 1000);
     fgets(line, 1000, stdin);
     //printf(line);
     if(!strcmp(line, "quit\n") || !strcmp(line, "exit\n")){
         break;
     }
     crr = strtok(line, delim);
     int i = 0;
     do{
       args[i] = crr;
       printf("%s\n", args[i]);
       crr = strtok(NULL, delim);
       i++;
     }while(crr != NULL);
     args[i] = NULL;

     if(fork() == 0){
        printf("%s\n", args[1]);
        execvp(args[0], args);
     }else{
      int k;
      wait(&k);
     }
   }
  return 0;
}