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This is a command line program that may be used to compute any checkdigit
known by the perl module Algorithm::CheckDigits.

=head1 OPTIONS AND COMMANDS

=head2 Options

=head3 -algorithm alg

Compute checkdigits according to algorithm I<alg>. Instead of providing the
algorithm with this option, you may choose to rename the program to the name
of the algorithm or to C<< checkdigits- >> followed by the name of the algorithm.

You must provide the algorithm with any of these means or the program will not
compute any checkdigit.

=head2 Commands

=head3 check

=head3 checkdigit