from perldoc Getopt::Long
An incremental option is specified with a plus "+" after
the option name:
my $verbose = ''; # option variable with default value (false)
GetOptions ('verbose+' => \$verbose);
Using "--verbose" on the command line will increment the
value of "$verbose". This way the program can keep track
of how many times the option occurred on the command line.
For example, each occurrence of "--verbose" could increase
the verbosity level of the program.
mkmcconn
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