title: Dockerfile build /bin/sh -c returned a non-zero code: 1
body: <p>my dockerfile conf:</p>
  
  <pre><code>    FROM ubuntu:16.04
      MAINTAINER S.K.
      RUN apt-get update
      RUN apt-get install curl -y
      RUN curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.32.1/install.sh | bash
      RUN export NVM_DIR="$HOME/.nvm"
      RUN [ -s "$NVM_DIR/nvm.sh" ] &amp;&amp; . "$NVM_DIR/nvm.sh"
      RUN nvm install node
      RUN nvm use 6.9.1
      RUN npm i express -g
      RUN npm i nunjucks -g
      RUN npm i nodemon -g
      RUN mkdir -p PROJECT
      VOLUME /PROJECT/
      EXPOSE 1520
  </code></pre>
  
  <hr>
  
  <p>In the step <code>RUN [ -s "$NVM_DIR/nvm.sh" ] &amp;&amp; . "$NVM_DIR/nvm.sh"</code> Im get error:</p>
  
  <pre><code>The command '/bin/sh -c [ -s "$NVM_DIR/nvm.sh" ] &amp;&amp; . "$NVM_DIR/nvm.sh"' returned a non-zero code: 1 
  </code></pre>
  
  <p>Everybody knows how I can fix it ?</p>