title: "man" command returning duplicated results in mac terminal
body: <p>When I</p>
  <pre><code>man -k &quot;^printf&quot;
  </code></pre>
  <p>in terminal,
  it returns duplicated results below:</p>
  <pre><code>printf(1)                - formatted output
  printf(1)                - formatted output
  printf(3), fprintf(3), sprintf(3), snprintf(3), asprintf(3), dprintf(3), vprintf(3), vfprintf(3), vsprintf(3), vsnprintf(3), vasprintf(3), vdprintf(3) - formatted output conversion
  </code></pre>
  <p>And,
  When I</p>
  <pre><code>man -k 1
  </code></pre>
  <p>It also returns a bunch of duplicated results.</p>
  <p>It's a new M1 MAX Mac,
  I didn't even do any setting changes yet, but the problem above is actually happening.
  What's wrong with my new Mac?</p>