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

int main(int argc, char* argv[])
{
  int status;
  char *myArgs[5] = {NULL, NULL, NULL, NULL, NULL};

  if (argc < 2) {
    goto usage_err;
  }
  
  if (strcmp(argv[1], "nopathnoext")==0) {
    myArgs[0] = "echo";
    myArgs[1] = "NoPathNoExt";
    /* execvp(myArgs[0], myArgs); */
    execlp("echo","echo","NoPath", NULL);
    perror("nopathnoext");
    exit(0);
  } else if (strcmp(argv[1], "nopathext")==0) {
    myArgs[0] = "echo.exe";
    myArgs[1] = "NoPathExt";
    execvp(myArgs[0], myArgs); 
    perror("nopathext");
    exit(0);
  } else if (strcmp(argv[1], "pathnoext")==0) {
    myArgs[0] = "/usr/bin/echo";
    myArgs[1] = "PathNoExt";
    execvp(myArgs[0], myArgs); 
    perror("pathnoext");
    exit(0);
  } else if (strcmp(argv[1], "pathext")==0) {
    myArgs[0] = "/usr/bin/echo.exe";
    myArgs[1] = "PathExt";
    execvp(myArgs[0], myArgs); 
    perror("pathext");
    exit(0);
  }

 usage_err:

  printf("Usage: %s nopathnoext|nopathext|pathnoext|pathext\n", argv[0]);
  exit(0);
}