def _concatenate_file(self, file_list, output):
to_cat = '<STR_LIT:U+0020>'.join(file_list)<EOL>logging.debug("<STR_LIT>" % (to_cat))<EOL>cmd = "<STR_LIT>" % (to_cat, output)<EOL>extern.run(cmd)<EOL>
Call unix "cat" to concatenate a list of files

Parameters
----------
file_list: list
    List of strings, each leading to a file. These files are the ones to
    be concatenate together. E.g.:
        ["/path/to/file1", "/path/to/file2"]
output: str
    Path to file to which to the files in file_list will be concatenated
    into.