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pwck
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===
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用来验证系统认证文件内容和格式的完整性
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## 补充说明
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**pwck命令** 用来验证系统认证文件`/etc/passwd`和`/etc/shadow`的内容和格式的完整性。
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### 语法
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```
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pwck(选项)(参数)
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```
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```
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-q：仅报告错误信息；
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-s：以用户id排序文件“/etc/passwd”和“/etc/shadow”;
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-r：只读方式运行指令。
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```
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### 参数
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* 密码文件：指定密码文件的路径；
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* 影子文件：指定影子文件的路径。
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### 实例
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```
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pwck /etc/passwd
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user 'lp': directory '/var/spool/lpd' does not exist
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user 'news': directory '/var/spool/news' does not exist
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user 'uucp': directory '/var/spool/uucp' does not exist
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user 'www-data': directory '/var/www' does not exist
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user 'list': directory '/var/list' does not exist
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user 'irc': directory '/var/run/ircd' does not exist
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user 'gnats': directory '/var/lib/gnats' does not exist
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user 'nobody': directory '/nonexistent' does not exist
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user 'syslog': directory '/home/syslog' does not exist
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user 'couchdb': directory '/var/lib/couchdb' does not exist
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user 'speech-dispatcher': directory '/var/run/speech-dispatcher' does not exist
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user 'usbmux': directory '/home/usbmux' does not exist
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user 'haldaemon': directory '/var/run/hald' does not exist
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user 'pulse': directory '/var/run/pulse' does not exist
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user 'saned': directory '/home/saned' does not exist
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user 'hplip': directory '/var/run/hplip' does not exist
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pwck：无改变
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```
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