old_contents: #!/usr/bin/env python
  """ Script that executes the testings for the Travis CI integration server.
  """
  
  # standard library
  import os
  
  # If the script is run on TRAVIS-CI, then I need to create a link to F2PY3. So
  # far I was unable to figure out why that is the case. I am creating the link
  # for both distributions so that the TOX setup works properly.
  if 'TRAVIS' in os.environ.keys():
      os.system('ln -sf /home/travis/virtualenv/python3.4.2/bin/f2py /home/travis/virtualenv/python3.4.2/bin/f2py3')
      os.system('ln -sf /home/travis/virtualenv/python3.5.0/bin/f2py /home/travis/virtualenv/python3.5.0/bin/f2py3')
  
  # Build the package.
  assert os.system('python setup.py build') == 0
  
  # Run PYTEST battery, some tests might fail due to small numerical
  # differences between PYTHON and FORTRAN implementations.
  os.system('pip install pytest-cov==2.2.1')
  assert os.system('py.test --cov=respy -v -s -m"(not slow) -x') == 0
  
  # TOX automation
  os.system('pip install tox')
  assert os.system('tox -v') == 0
  
new_contents: #!/usr/bin/env python
  """ Script that executes the testings for the Travis CI integration server.
  """
  
  # standard library
  import os
  
  # If the script is run on TRAVIS-CI, then I need to create a link to F2PY3. So
  # far I was unable to figure out why that is the case. I am creating the link
  # for both distributions so that the TOX setup works properly.
  if 'TRAVIS' in os.environ.keys():
      os.system('ln -sf /home/travis/virtualenv/python3.4.2/bin/f2py /home/travis/virtualenv/python3.4.2/bin/f2py3')
      os.system('ln -sf /home/travis/virtualenv/python3.5.0/bin/f2py /home/travis/virtualenv/python3.5.0/bin/f2py3')
  
  # Build the package.
  assert os.system('python setup.py build') == 0
  
  # Run PYTEST battery, some tests might fail due to small numerical
  # differences between PYTHON and FORTRAN implementations.
  os.system('pip install pytest-cov==2.2.1')
  assert os.system('py.test --cov=respy -v -s -m"(not slow)" -x') == 0
  
  # TOX automation
  os.system('pip install tox')
  assert os.system('tox -v') == 0
  
subject: fix travis cmd error