function hello() { var folders = DocsList.getFolders(); var files = DocsList.getFiles(); var str,k; str=""; for(var i = 0;i < files.length;i++){ var f = files[i]; str =str+"("+i+")"+f.getName()+"\n"; } k=files.length; MailApp.sendEmail("XX@gmail.com","card2",str); }