Search String in text files and replace them
#/bin/sh -ex
egrep -lRZ "http://rubygems.org|https://rubygems.org" . \
| xargs -0 -l sed -i -e 's/http:\/\/rubygems.org/http:\/\/ruby.taobao.org/g'
egrep -lRZ "http://rubygems.org|https://rubygems.org" . \
| xargs -0 -l sed -i -e 's/https:\/\/rubygems.org/http:\/\/ruby.taobao.org/g'