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检测bash是否需要升级-jeenful的博客
source link: http://blog.51cto.com/2685141/2074582
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env x='(){:;}; echo be careful' bash -c "echo this is a test"如果返回this is a test不需要升级如果返回be carefulthis is a test就需要升级了升级命令：yum -y update bash
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