title: The ctags command doesn't recurse saying "it is not a regular file"
body: <p>When I run <code>ctags -R *</code>, I get errors saying that all directories are not regular files and it skips them instead of recursively generating tags for them.</p>
  
  <pre><code>ctags: skipping arpa: it is not a regular file.
  ctags: skipping asm: it is not a regular file.
  ctags: skipping asm-generic: it is not a regular file.
  ctags: skipping bits: it is not a regular file.
  ctags: skipping blkid: it is not a regular file.
  ctags: skipping boost: it is not a regular file.
  </code></pre>
  
  <p>What is the problem?</p>