env t='() { :;}; echo You are vulnerable.' bash -c "true"
在终端命令行中运行以上代码，如果提示“You are vulnerable”，请马上打上被丁.
Ubuntu or Debian 请执行
apt-get update -y
apt-get upgrade -y
RedHat, CentOS or Fedora 请执行
yum clean all
yum -y update bash
yum update -y
编译升级bash
wget /gnu/bash/bash-4.3.tar.gz
tar zxf bash-4.3.tar.gz ; cd bash-4.3
wget -r -nd -np /gnu/bash/bash-4.3-patches/
for BP in `ls bash43-*|grep -v sig`; do patch -p0 < $BP; done
./configure
make && make install
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