| Rel is a program that determines the relevance of text documents to a set of keywords expressed in boolean infix notation. The list of file names that are relevant are printed to the standard output, in order of relevance. The boolean logical operators supported are, "&" for logical "and," "|" for logical "or," and "!" for logical "not." Parenthesis are used as grouping operators. Both phonetic and partial key searches are fully supported. |