title: How do you capture stderr, stdout, and the exit code all at once, in Perl?
body: <p>Is it possible to run an external process from Perl, capture its stderr, stdout AND the process exit code?</p>
  
  <p>I seem to be able to do combinations of these, e.g. use backticks to get stdout, IPC::Open3 to capture outputs, and system() to get exit codes.</p>
  
  <p>How do you capture stderr, stdout, and the exit code all at once?</p>