title: Replacing values in csv using powershell
body: <p>I need to overwrite the email value in userinfo.csv with the email address from email.csv
  userid and u_user values are matching and unique in both csv's. The email address value in userinfo.csv in not good and needs to be overwritten with the email value from email.csv.</p>
  
  <p>How do I match userid in both csv's and append email value?</p>
  
  <p>No idea where to even start. Any help, please.</p>
  
  <pre><code>email.csv
  userid,email
  1234,user4@email.com
  1235,user5@email.com
  
  userinfo.csv
  u_work,u_user,u_address,u_city,u_state,u_zip,u_email,u_phonehome
  1234,here,there,everywhere,55555,1234@bad.org,555-555-5555
  away,1235,there,here,everywhere,66666,1235@bad.com,666-666-6666
  
  new.csv
  u_work,u_user,u_address,u_city,u_state,u_zip,u_email,u_phonehome
  1234,here,there,everywhere,55555,user4@email.com,555-555-5555
  away,1235,there,here,everywhere,66666,user5@email.com,666-666-6666
  </code></pre>