It is possible to store SHA1 hashes of password in CSV file.

 - It is more secure than password in plaintext.
 - You can create SHA1 hash with openssl command line tool:
    $ echo -n "my_secret_pass" | openssl dgst -sha1
 - CSV file has to have different header:
   username,passhash,UID,real name
 - TODO:
   - add support for other hashes (md5, sha256, sha512)
   - better format and parsing of CSV header