版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/inforstack/article/details/75910048
Permissions 0777 for 'tools/cncl' are too open.
It is required that your private key files are NOT accessible by others.
This private key will be ignored.
Load key "tools/cncl": bad permissions
Permission denied (publickey).用户对文件操作权限
- r可读2^2=4
- w可写2^1=2
- x可执行2^0=1
PS:7最高权限
chmod 700 tools/cncl //当前用户拥有所有权限，其它用户没有权限