centos yum,npm源更换

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# 备份
$ mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
$ cd /etc/yum.repos.d/​
$ wget http://mirrors.163.com/.help/CentOS7-Base-163.repo
# 生成缓存:
$ yum clean all
$ yum makecache​
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# npm源更换
$ alias cnpm="npm --registry=https://registry.npm.taobao.org
--cache=$HOME/.npm/.cache/cnpm
--disturl=https://npm.taobao.org/dist
--userconfig=$HOME/.cnpmrc"​
# npm升级
$ npm update npm​