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Notes from Ousterhout.


    <ul>
      <li>Interactive programs need command languages:
	<ul>
	  <li>Typically redone for each application.</li>
	  <li>Result: weak, quirky.</li>
	  <li>emacs and csh powerful, but can't reuse.</li>
	</ul>
      </li>

      <li>Solution: reusable scripting language.

	<ul>
	  <li>Interpreter is a C library.</li>
	  <li>Provides basic features: variables, procedures, etc.</li>
	  <li>Applications extend with additional features.</li>
	</ul>
      </li>
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