Update README.md

README.md

@@ -187,3 +187,17 @@ clear all docker logs
 truncate -s 0 /var/lib/docker/containers/*/*-json.log;
 ``` 
 
+## delete all images
+
+``` bash
+docker rmi -f $(docker images -aq)
+``` 
+
+## delete all images
+
+``` bash
+docker volume rm $(docker volume ls -qf dangling=true)
+``` 
+
+
+