Besides traditional one-letter POSIX-style options, cluscomp also supports GNU long options. Options begin with a dash, and consist of a single character. GNU style long options consist of two dashes and a keyword. If the option takes an argument, then the keyword is immediately followed by whitespace and then the argument's value.
In general, cluscomp is invoked with the following usage:
If more than two datafiles are specified on the command line, cluscomp
will compute indexes between each unique pair. However, if one wants to
only compute indexes between one standard datafile and many others, then