recursive replace string in files with rpl

Dry run (‘s’ option)

rpl -Rs -x'.rst' '2010-2012' '2010-2013' .
rpl -Rs olstring  newstring  .

Replace (without ‘s’ option)

rpl -R -x'.rst' '2010-2012' '2010-2013' .
rpl -R olstring  newstring  .