add log

@@ -72,8 +72,12 @@ class ApiCache {
                 let self = this;
                 conn.on('ready', async() => {
                     try {
-                        conn.exec(`sudo kill -9 ${pid}`, (err, stream) => {
-                            conn.end();
+                        conn.exec(`sudo kill ${pid}`, (err, stream) => {
+                            if(err) {
+                                console.log(err);
+                            } else {
+                                console.log(`sudo kill ${pid} --> success`);
+                            }
                         });
                     } catch (e) {
                         console.log(e);