问题
用ls和cat命令可以访问到路径指向的文件及其内容。
调查
从上图可以看出gcc和g++所在路径不同，gcc是一个Cygwin程序，而g++是一个Windows/DOS程序。
解决方案
- 用Cygwin安装程序安装gcc-g++包
- Cygwin的PATH环境变量会继承Windows/DOS的PATH配置，为避免混淆应重置取消不必要的路径配置，如：
PATH=/usr/local/bin:/usr/bin
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