pass.words是弱口令字典，是一个纯文本文件，每行一个口令，可以向里面添加候选口令。

pass.c是进行口令检查的c语言原程序，有两个命令行参数

-w file: 可以使用该选项指定口令字典

-P:默认情况下对/etc/shadow中的用户检查弱口令，可以使用该选项指定检查的文件

编译gcc –o pass pass.c –l crypt

由于要使用加密函数，所以要使用加密库crypt，使用选项-l crypt

运行程序：pass –w ./pass.words –p /etc/shadow

-pass.words is a weak password dictionary, is a plain text file, one per line password, you can add to the inside candidate password. Password pass.c is the c language of the original inspection procedures, there are two command-line parameters-w file: You can use the password option specifies a dictionary-P: By default on/etc/shadow user to check the weak password, you can use the option to specify the documents to check the compiler gcc-o pass pass.c-l crypt function due to the use of encryption, so the use of encryption library crypt, use the option-l crypt running the program: pass-w./pass.words-- p/etc/shadow