If lastupdate is not present, then a password has never been set.
如果lastupdate不存在，就说明没有设置过密码。
From the above output, you can tell that user alpha does have a password set by the lastupdate entry.
在上面的输出中，可以通过lastupdate条目看出用户alpha已经设置了密码。
You can see the lastupdate value in seconds from the above output. In other words, the last time the password was changed.
在上面的输出中可以看到以秒为单位的lastupdate值。
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