# cf.abspath

`cf.``abspath`(filename)

  Return a normalized absolute version of a file name.

  If a string containing URL is provided then it is returned unchanged.

  See also

  `cf.dirname`, `cf.pathjoin`, `cf.relpath`

  Parameters: | filename: `str` The name of the file.
  Returns: | out: `str` The normalized absolutized version of filename.
  Examples: |

      >>> import os
      >>> os.getcwd()
      '/data/archive'
      >>> cf.abspath('file.nc')
      '/data/archive/file.nc'
      >>> cf.abspath('..//archive///file.nc')
      '/data/archive/file.nc'
      >>> cf.abspath('http://data/archive/file.nc')
      'http://data/archive/file.nc'