bash 的漏洞，你们中招了吗？
http://threatpost.com/major-bash-vulnerability-affects-linux-unix-mac-os-x检测：
$ env x='(){:;}; echo vulnerable' bash -c "echo this is a test"
中招的显示:
vulnerable
this is a test
如果是没有问题，则是下面
$ env x='(){:;}; echo vulnerable' bash -c "echo this is a test"
bash: warning: x: ignoring function definition attempt
bash: error importing function definition for `x'
this is a test
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