title: Specifying multiple files with LD_PRELOAD
body: <p>I know how to override one library with LD_PRELOAD, for example, as follows.</p>
  
  <pre><code>LD_PRELOAD=./getpid.so ./testpid
  </code></pre>
  
  <p>Now my question is how to override multiple files. Say I want to override both getpid and getid, how would I specify that?</p>