text: #include<stdio.h>
  #include<unistd.h>
  
  int main()
  {
  	//int ret;	
  	printf("I am going to execute  an 'ls' program\n");
  	
  	execl("/bin/ls","ls","-lh", 0);// ls OS defined pg,
  					// final arg 0 indicates end of string..
  
  	printf("i executed ls program ");
  	printf("i executed ls program ");
  	printf("i executed ls program ");
  }
  
  
  
  	// execl("path of new pg to be loaded",  agrments as list of string, NULL);
  
  	//execl()
  
  	//success retuen 0   and on failure return -1
  