title: Add all files to a commit except a single file?
body: <p>I have a bunch of files in a changeset, but I want to specifically ignore a single modified file. Looks like this after <code>git status</code>:</p>
  
  <pre><code># modified:   main/dontcheckmein.txt
  # deleted:    main/plzcheckmein.c
  # deleted:    main/plzcheckmein2.c
  ...
  </code></pre>
  
  <p>Is there a way I can do <code>git add</code> but just ignore the one text file I don't want to touch? Something like:</p>
  
  <pre><code>git add -u -except main/dontcheckmein.txt
  </code></pre>