cd ../wp-content/plugins/contact-form-plugin/
cp contact_form.php contact_form_original.php
now replace all contact_form with bws_contact_form in contact_form.php
perl -pi.back1 -e ‘s/contact_form/bws_contact_form/g;’ contact_form.php
now adjust link
perl -pi.back2 -e ‘s/bws_contact_form.php/contact_form.php/g;’ contact_form.php
