old_contents: var shell = require('./phylo-node_pipes');
  
  // execute multiple commands in series
  shell.chain([
      //enter all the commands in series in this array 
      //separated by a comma and inside quotes
      'node ../Sequences/index.js NM_001028053.2 AF032112.1 NM_001129696.2',
      'node index_2.js NM_001028053.2.fasta'
  ], function (err) {
      console.log('\n' + 'multiple commands successfully piped' + '\n');
  });
new_contents: var shell = require('./phylo-node_pipes');
  
  // execute multiple commands in series
  shell.chain([
      //enter all the commands in series in this array 
      //separated by a comma and inside quotes
      'node ../Sequences/app.js NM_001028053.2 AF032112.1 NM_001129696.2',
      'node app_2.js NM_001028053.2.fasta'
  ], function (err) {
      console.log('\n' + 'multiple commands successfully piped' + '\n');
  });
  
subject: Update pipe_example.js