title: jmap [option] <executable <core> - what does that mean and how to use it?
body: <p>I'm trying to use jmap utility.
  It's too hard to specify pid each time, so I search for easier option.
  In jmap's help I found an option </p>
  
  <p><strong>jmap [option] &lt; executable &lt; core ></strong></p>
  
  <p>But this absolutely not self-explanatory.
  What stands for executable/core? How can I specify it ?  Haven't found any sample.</p>