纠正错误 添加实例

# pwck

用来验证系统认证文件内容和格式的完整性

## 补充说明

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。

### 语法

    pwck(选项)(参数)

### 选项

    -q：仅报告错误信息；
    -s：以用户id排序文件“/etc/passwd”和“/etc/shadow”;
    -r：只读方式运行指令。

### 参数

- 密码文件：指定密码文件的路径；
- 影子文件：指定影子文件的路径。

### 实例

    pwck /etc/passwd
    user 'lp': directory '/var/spool/lpd' does not exist
    user 'news': directory '/var/spool/news' does not exist
    user 'uucp': directory '/var/spool/uucp' does not exist
    user 'www-data': directory '/var/www' does not exist
    user 'list': directory '/var/list' does not exist
    user 'irc': directory '/var/run/ircd' does not exist
    user 'gnats': directory '/var/lib/gnats' does not exist
    user 'nobody': directory '/nonexistent' does not exist
    user 'syslog': directory '/home/syslog' does not exist
    user 'couchdb': directory '/var/lib/couchdb' does not exist
    user 'speech-dispatcher': directory '/var/run/speech-dispatcher' does not exist
    user 'usbmux': directory '/home/usbmux' does not exist
    user 'haldaemon': directory '/var/run/hald' does not exist
    user 'pulse': directory '/var/run/pulse' does not exist
    user 'saned': directory '/home/saned' does not exist
    user 'hplip': directory '/var/run/hplip' does not exist
    pwck：无改变