pam_dotfile is a PAM module which allows users to have more than one password for a single account, each for a different service. This is desirable because many users have objections to using the same password for (as an example) an IMAP4 mailbox and SSH access.
pam_dotfile是一个允许用户为个人账户设置多个口令来执行不同服务的PAM模块。这个功能是值得的,因为很多用户拒绝使用相同的口令来收发一个IMAP4邮箱和访问SSH。