passwd是类Unix系统中用于记录登录的用户密码的文档，类似于Windows下的*.pwl文档。这类文档通常会放在etc目录之下。 同时，类Unix系统中可用此命令更改特定用户的密码。

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passwd is a tool on most Unix and Unix-like operating systems used to change a user's password. The password entered by the user is run through a key derivation function to create a hashed version of the new password, which is saved. Only the hashed version is stored; the entered password is not saved for security reasons.