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The self-documentation tells us the function of the program, as well as the parameters that are available to be specified. The parameter format is type - name=default value [options] and then a short description of the parameter. File parameters request a name of a file. For example:
file=file.rsf
Note: strings with spaces must be enclosed in quotation marks (e.g. 'my value') so that the Unix shell could interpret them correctly.