title: whats the difference between a command and a statement
body: <p>Often when reading about Tcl (e.g. <a href="http://antirez.com/articoli/tclmisunderstood.html" rel="nofollow noreferrer">http://antirez.com/articoli/tclmisunderstood.html</a>) you read that "everything is a command".  Sometimes you also hear how other languages are, like Tcl, "command languages."  </p>
  
  <p>To me with my background in other languages, I just view these "commands" as statements.  What precisely is the difference between a command and a statement?</p>