title: parallel running of jobs in unix
body: <p>I have following jobs (just as example) to run in unix (bash shell) cluster computers: </p>
  
  <pre><code>### job1
  mkdir file01
  cp *.map  flex01
  date &gt; out
  cd ..
  
  ### job2
  mkdir file02
  cp *.map  flex02
  date &gt; out
  cd ..
  
  ### job3
  mkdir file03
  cp *.map  flex03
  date &gt; out
  cd ..
  
  ### job4
  mkdir file04
  cp *.map  flex04
  date &gt; out
  cd ..
  </code></pre>
  
  <p>If I submit these jobs, we do one by one. But I want to run them in parallel means that job1 to job4 running at the same time at the background. </p>
  
  <p>How can I do it ? Sorry for the simple question, I am new to unix. </p>