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/usr/lib/urxvt/perl/selection-to-clipboard is in rxvt-unicode 9.22-1+b1.

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#! perl -w

=head1 NAME

selection-to-clipboard - copy the selection to the clipboard each time a selection is made

=head1 SYNOPSIS

   urxvt -pe selection-to-clipboard

=head1 DESCRIPTION

This very simple extension copies the selection to the clipboard every
time a selection is made. This, in effect, synchronises the clipboard with
the selection for selections done by rxvt-unicode.

=cut

sub on_sel_grab {
   my ($self, $time) = @_;

   $self->selection ($self->selection, 1);
   $self->selection_grab ($time, 1);

   ()
}