我试图解析一些 nginx 配置
λ tree sites-enabled/ sites-available/
sites-enabled/
├── bank.cwrcoding.com.conf
├── calendar.cwrcoding.com.conf
├── cloud.cwrcoding.com.conf
├── cwrcoding.com.conf
├── drive.cwrcoding.com.conf
├── groups.cwrcoding.com.conf
├── mail.cwrcoding.com.conf
├── sites.cwrcoding.com.conf
├── studentenverwaltung.cwrcoding.com.conf
├── wekan.cwrcoding.com.conf
└── www.cwrcoding.com.conf
sites-available/
├── bank.cwrcoding.com.conf
├── calendar.cwrcoding.com.conf
├── cloud.cwrcoding.com.conf
├── cwrcoding.com.conf
├── drive.cwrcoding.com.conf
├── groups.cwrcoding.com.conf
├── mail.cwrcoding.com.conf
├── sites.cwrcoding.com.conf
├── studentenverwaltung.cwrcoding.com.conf
├── wekan.cwrcoding.com.conf
└── www.cwrcoding.com.conf
sites-enabled/* 文件每个都包含一行：
include sites-availabe/cwrcoding.com.conf;
当尝试遍历启用站点的/ *文件，剪切这些文件并尝试将其内容作为文件读取时，我遇到了一些奇怪的错误，所以我尝试了一个简约的工作解决方案，并从那里开始工作，但是以下发生：
λ for enabled in sites-enabled/*
> do
> echo "$(cat "$enabled") |"
> echo ==========
> done
include sites-available/bank.cwrcoding.com.conf; |
==========
|clude sites-available/calendar.cwrcoding.com.conf;
==========
|clude sites-available/cloud.cwrcoding.com.conf;
==========
|clude sites-available/cwrcoding.com.conf;
==========
|clude sites-available/drive.cwrcoding.com.conf;
==========
|clude sites-available/groups.cwrcoding.com.conf;
==========
|clude sites-available/mail.cwrcoding.com.conf;
==========
|clude sites-available/sites.cwrcoding.com.conf;
==========
|clude sites-available/studentenverwaltung.cwrcoding.com.conf;
==========
include sites-available/wekan.cwrcoding.com.conf; |
==========
|clude sites-available/www.cwrcoding.com.conf;
==========
如您所见，对于大多数站点，cat输出的第一个字符被替换为命令替换后的文本。
谁能解释发生了什么？还是我发现了一些错误？