title: what does @D mean in shell script
body: <p>i have a code as </p>
  
  <pre><code>   echo -e "\\n" "=====  Making: $(@D)\n";\
      if [ ! -d $(@D) ]; then \
              mkdir $(@D); \
      else \
              if [ -e $(@D)\PackageBuild.error ]; then \
                      rm $(@D)\PackageBuild.error;\
              fi; \
  </code></pre>
  
  <p>i am not sure what this @D is doing.
  can someone help me out here</p>