Chain RUN commands

Dockerfile

@@ -2,27 +2,27 @@ FROM debian:wheezy
 MAINTAINER sohrab <sohrab@sixtree.com.au>
 
 # install supporting tools
-RUN apt-get update
-RUN apt-get install -y procps wget
+RUN apt-get update && \
+    apt-get install -y procps wget
 
 WORKDIR /tmp
 
 # install Oracle JRE
 RUN wget --no-check-certificate --no-cookies \
          --header "Cookie: oraclelicense=accept-securebackup-cookie" \
-         http://download.oracle.com/otn-pub/java/jdk/7u75-b13/jre-7u75-linux-x64.tar.gz
-RUN tar -zxf jre-7u75-linux-x64.tar.gz -C /opt
-RUN ln -s /opt/jre1.7.0_75 /opt/jre
-RUN update-alternatives --install /usr/bin/java java /opt/jre/bin/java 100
+         http://download.oracle.com/otn-pub/java/jdk/7u75-b13/jre-7u75-linux-x64.tar.gz && \
+    tar -zxf jre-7u75-linux-x64.tar.gz -C /opt && \
+    ln -s /opt/jre1.7.0_75 /opt/jre && \
+    update-alternatives --install /usr/bin/java java /opt/jre/bin/java 100
 
 ENV JAVA_HOME /opt/jre
 ENV JRE_HOME $JAVA_HOME
 
 # install Mule CE
 RUN wget --no-check-certificate \
-         https://repository-master.mulesoft.org/nexus/content/repositories/releases/org/mule/distributions/mule-standalone/3.6.1/mule-standalone-3.6.1.tar.gz
-RUN tar -zxf mule-standalone-3.6.1.tar.gz -C /opt
-RUN ln -s /opt/mule-standalone-3.6.1 /opt/mule
+         https://repository-master.mulesoft.org/nexus/content/repositories/releases/org/mule/distributions/mule-standalone/3.6.1/mule-standalone-3.6.1.tar.gz && \
+    tar -zxf mule-standalone-3.6.1.tar.gz -C /opt && \
+    ln -s /opt/mule-standalone-3.6.1 /opt/mule
 
 ENV MULE_HOME /opt/mule
 ENV PATH $PATH:$MULE_HOME/bin