setop - 0.1-1+b5 main

setop is a simple console utility for handling multiple inputs from files or
other streams as mathematical sets. That is you can apply typical set
operations like union, intersection, or set difference and print a resulting
set (sorted and with unique string elements) to standard output or you can give
answer to special queries like number of elements.
.
Besides the default line-based parsing there are several options for choosing
input sets and identifying set elements, and there are also several options for
the type of output, e. g. it is possible to check for set equality or to check
if one set is a subset of another.