out_filename = "{0}{1}.new".format(path, suffix)
if cmd is not None:
with open(in_filename, 'r') as in_fh, open(out_filename, 'w') as out_fh:
out_filename = "{0}{1}.new".format(path, suffix)
if cmd is not None:
with open(in_filename, 'r') as in_fh, open(out_filename, 'w') as out_fh: