title: How to exclude some calls in strace?
body: <p>I want to trace system calls with strace. There are too many read and write, so I want to exclude them.</p>
  <p>Here is my test:</p>
  <pre><code>strace -e trace=!read ls
  </code></pre>
  <p>My PC (Ubuntu 14) failed to run this command. The error message is <code>!open: event not found</code>. I have read the man carefully and I can't understand why it failed.</p>