These command line arguments can also be put into a file named ``.cxref'' instead of on the command line. When cxref is run the arguments to the program are interpreted in the following order.
This means that in a multi-directory source tree, each sub-directory can have a ``.cxref'' file containing just the line ``-R..'' or appropriate. The main directory can have a ``.cxref'' file containing the remainder of the options. This removes completely the need to have any options on the command line apart from the source file names.
The format of the .cxref file is any number of lines, each one containing a single command line argument (equivalent to one of the argv). The only options that cannot be used are the names of source files themselves and the ``-delete'' option. Blank lines are ignored and lines starting with a `#' are comments.