title: Include directory with subdirectories in SSH configuration: issue with autocomplete
body: <p>I am running OpenSSH 8.2 on Ubuntu 20.04. I would like to structure my .ssh/config file so that it includes directories with subdirectories:</p>
  <pre><code>Include config.d/*
  Include config.d/dir1/*
  Include config.d/dir2/*
  Include config.d/dir3/*
  
  </code></pre>
  <p>If I have a host <code>remotevm</code> and I try the autocompletion when I type <code>ssh remotevm</code>, I get the following error:</p>
  <pre><code>$ ssh remosed: read error on /home/user/.ssh/config.d/dir1: Is a directory
  sed: read error on /home/user/.ssh/config.d/dir2: Is a directory
  sed: read error on /home/user/.ssh/config.d/dir3: Is a directory
  awk: read error (Is a directory)
  </code></pre>
  <p>What can I do so that the autocompletion works again like before?</p>
  <p>Best regards</p>