$ npm install -g nreg

npm -> https://registry.npmjs.org/

yarn -> https://registry.yarnpkg.com/

tencent -> https://mirrors.cloud.tencent.com/npm/

cnpm -> https://r.cnpmjs.org/

taobao -> https://registry.npmmirror.com/

npmMirror -> https://skimdb.npmjs.com/registry/

Usage: nreg [options] [command]

Options:
-V, --version output the version number
-h, --help display help for command

Commands:

list         list packages
use        Please select a registry
current      current registry
add         add registry
del [options]    delete registry
rename      rename registry
edit        edit registry
ping [regName]  ping registry
help [command]  display help for command