出于某种原因，我无法通过cygwin运行任何流浪命令。虽然通过简单的命令行（cmd）运行它们时一切正常。
通过cygwin时，我收到了这样的错误：
$ vagrant halt
I:/selfwork/Homestead/scripts/homestead.rb:4:in `configure': undefined method `[]' for nil:NilClass (NoMethodError)
from I:/selfwork/Homestead/Vagrantfile:28:in `block in <top (required)>'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.8.1/lib/vagrant/config/v2/loader.rb:37:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.8.1/lib/vagrant/config/v2/loader.rb:37:in `load'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.8.1/lib/vagrant/config/loader.rb:113:in `block (2 levels) in load'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.8.1/lib/vagrant/config/loader.rb:107:in `each'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.8.1/lib/vagrant/config/loader.rb:107:in `block in load'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.8.1/lib/vagrant/config/loader.rb:104:in `each'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.8.1/lib/vagrant/config/loader.rb:104:in `load'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.8.1/lib/vagrant/vagrantfile.rb:28:in `initialize'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.8.1/lib/vagrant/environment.rb:740:in `new'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.8.1/lib/vagrant/environment.rb:740:in `vagrantfile'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.8.1/lib/vagrant/environment.rb:486:in `host'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.8.1/lib/vagrant/environment.rb:208:in `block in action_runner'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.8.1/lib/vagrant/action/runner.rb:33:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.8.1/lib/vagrant/action/runner.rb:33:in `run'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.8.1/lib/vagrant/environment.rb:473:in `hook'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.8.1/lib/vagrant/environment.rb:722:in `unload'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.8.1/bin/vagrant:177:in `ensure in <main>'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.8.1/bin/vagrant:177:in `<main>'
但在homestead.rb中，第4行没什么特别的：
1 class Homestead
2 def Homestead.configure(config, settings)
3 # Set The VM Provider
4 ENV['VAGRANT_DEFAULT_PROVIDER'] = settings["provider"] ||= "virtualbox"
Vagrantfile的第28行是对configure的简单调用：
28 Homestead.configure(config, settings)
同样，一切都通过简单的命令行完成。
以前我在cygwin使用vagrant但在Windows 7上没有任何问题。目前我尝试在Windows 10上使用它。
也许我错过了任何特殊选项？
这是cygwin