fabric-execute.py

@task
def stats():
    with tempfile.NamedTemporaryFile() as f:
        f.write('first line')
        execute(collect, f.name)

        import pdb; pdb.set_trace()
        # from pdb, get f.name, and cat the file shows N lines in the file without "first line"

        f.seek(0)
        # cat the temp file, only has "first line"
        for l in f:
            print(green(l)) # prints "first line"

@task
@parallel
@roles('vm')
def collect(f_name):
  with open(f_name, 'a+b') as f:
      f.write('%s\n'.format(env.host))

  with open(f_name, 'r+b') as f:
      f.seek(0)
      print f.read() # prints this host plus whatever else got there first