/usr/share/doc/stilts/sun256/select.html is in stilts-doc 3.1.2-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | <html>
   
   <head>
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
      <link rel="stylesheet" type="text/css" href="sun-style.css">
      <title>select</title>
   </head>
   
   <body>
      <hr>
      <a href="seqview.html">Next</a> <a href="rowrange.html">Previous</a> <a href="filterSteps.html">Up</a> <a href="index.html">Contents</a> <br> <b>Next: </b><a href="seqview.html">seqview</a><br>
       <b>Up: </b><a href="filterSteps.html">Processing Filters</a><br>
       <b>Previous: </b><a href="rowrange.html">rowrange</a><br>
      
      <hr>
      <h4><a name="select">6.1.26 <code>select</code></a></h4>
      <p><strong>Usage:</strong>
         <pre>   select <expr></pre></p>
      <p>Include in the output table only rows for which the
         expression <code><expr></code> evaluates to true.
         <code><expr></code> must be an expression which
         evaluates to a boolean value (true/false).
         
      </p>
      <p>Syntax for the <code><expr></code> argument is described in <a href="jel.html">Section 10</a>.
         
      </p>
      <hr><a href="seqview.html">Next</a> <a href="rowrange.html">Previous</a> <a href="filterSteps.html">Up</a> <a href="index.html">Contents</a> <br> <b>Next: </b><a href="seqview.html">seqview</a><br>
       <b>Up: </b><a href="filterSteps.html">Processing Filters</a><br>
       <b>Previous: </b><a href="rowrange.html">rowrange</a><br>
      
      <hr><i>STILTS - Starlink Tables Infrastructure Library Tool Set<br>Starlink User Note256<br>STILTS web page:
         <a href="http://www.starlink.ac.uk/stilts/">http://www.starlink.ac.uk/stilts/</a><br>Author email:
         <a href="mailto:m.b.taylor@bristol.ac.uk">m.b.taylor@bristol.ac.uk</a><br>Mailing list:
         <a href="mailto:topcat-user@jiscmail.ac.uk">topcat-user@jiscmail.ac.uk</a><br></i></body>
</html>
 |