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=head1 DEFAULT OPTIONS

The C<readopts( \@ )> function reads default command-line options from a
rcfile and prepends them to the command-line arguments list C<@argv>. This
function is usually called immediately before the C<processopts()> function.

The basename of the rcfile is the program name with the
extension C<rc>. The dirname of the rcfile is defined by the
environment variable XDG_CONFIG_HOME (L<XDG Base Directory
Specification|https://specifications.freedesktop.org/basedir/latest/>).

The rcfile must contain one option per line. This implies that options must
not be grouped. Each line is either a simple flag name or an option name
followed by a space character and an option-argument value. Neither the
flag name nor the option name should start with the option delimiter (C<->).
Option-argument values should not be quoted even if they include spaces.
Example rcfile content:

  # verbose
  v