usage: ./cert-renew <arguments>
  version: V1-7
  get a new replacement certificate with the same DN as your existing cert.
  Only for OU=People, not for host or service certificates.
       -agree  flag to indicate acceptance of the DOEGrids policies
               described at http://www.doegrids.org/Docs/CP-CPS.pdf
       -cert <certificate to be replaced>
                 defaults to usercert.pem, only OU=People is allowed
       -key  <private key corresponding to certificate>
                 defaults to userkey.pem
       -passin <optional file containing passphrase for current private key>
       -passout <optional file containing passphrase for new private key>
                only used if the -newkey switch is given
       -email <user's email> required
       -phone <user's phone> required
       -prefix Causes the certificate to be renewed to be 
                 <prefix>cert.pem and <prefix>key.pem
                 instead of usercert.pem and userkey.pem
       -dir  <optional directory in which to find and store the 
                 certificate and key>
                 defaults to /home/olson/.globus
       -newkey generate a new key for the new certificate
       -ca  <name of CA to use, either 'test' or 'doegrids'>
       -dryrun   execute script but do not post the request to the CA
       -noclean   do not remove temporary files
       -debug spews lots of output to the terminal
       -help  prints this message
       -V  print package version and exit
       any omitted and required arguments will be prompted for
  This software is contributed to the DOEGrids PKI and is supported by
  the PPDG RA.  Please send any questions, comments, problems to
  ra@ppdg.net and/or dlolson@lbl.gov.


  Side effects:
    Generates some temporary files that get removed in normal operation.