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yum install apr-util -y
mkdir ab
cd ab
yum -y install yum-utils -y
yumdownloader httpd
yum localinstall httpd-2.2.15-26.el6.centos.x86_64.rpm
rpm2cpio httpd-2.2.3-91.el5.centos.i386.rpm |cpio -idmv
cp -pa usr/bin/ab /usr/bin/
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原文地址：http://www.cnblogs.com/wz0314/p/5052710.html
