title: Convert xlsx to csv in Linux with command line
body: <p>I'm looking for a way to convert xlsx files to csv files on Linux.</p>
  
  <p>I do not want to use PHP/Perl or anything like that since I'm looking at processing several millions of lines, so I need something quick. I found a program on the Ubuntu repos called xls2csv but it will only convert xls (Office 2003) files (which I'm currently using) but I need support for the newer Excel files.</p>
  
  <p>Any ideas?</p>