title: parallel : how to pass options to commands
body: <p>For parallelizing gzip compression:</p>
  
  <p><code>parallel gzip ::: myfile_*</code> </p>
  
  <p>does the job but how to pass gzip options such as <code>-r</code> or <code>-9</code> </p>
  
  <p>I tried <code>parallel gzip -r -9 ::: myfile_*</code> and <code>parallel gzip ::: 9 r myfile_*</code> </p>
  
  <p>but it doesn't work. </p>
  
  <p>when I tried <code>parallel "gzip -9 -r" ::: myfile_*</code></p>
  
  <p>I get this error message : </p>
  
  <p><code>gzip: compressed data not written to a terminal. Use -f to force compression</code></p>
  
  <p>Also the <code>-r</code> switch for recursively adding directories is not working.</p>
  
  <p>....</p>
  
  <p>Similarly for other commands: how to pass the options while using <code>parallel</code> ?</p>