Remove a useless '\' and enhance a script in an example in the section 'Add entries ... (--add-host)'
@@ -690,7 +690,7 @@ using IPv4 or IPv6 networking in your containers. Use the following
flags for IPv4 address retrieval for a network device named `eth0`:
```bash
-$ HOSTIP=`ip -4 addr show scope global dev eth0 | grep inet | awk '{print \$2}' | cut -d / -f 1`
+$ HOSTIP=`ip -4 addr show scope global dev eth0 | grep inet | awk '{print $2}' | cut -d / -f 1 | sed -n 1p`
$ docker run --add-host=docker:${HOSTIP} --rm -it debian
```
