grep -q "form.el.dom.action" /web/htdocs2/login/login.js; if [ $? -eq 0 ]; then echo File is already modified, exiting.; else echo File backed up and modified. ; sed -i.bak '/form.isValid/s/$/\nform.el.dom.action=formAction;\n/' /web/htdocs2/login/login.js ; fi