1 XRF XRF is a program that will create a concordance of an input file. It prints the input file with line numbers, and follows that with an alphabetical cross-reference of every word used in the input file and the line number(s) on which each word appears. A brief summary of the usage of XRF: XRF print out usage information for XRF XRF creates a concordance of the input file under the name ".X" XRF -O creates a concordance of the input file under the name "outfile.ext"