https://cache.ruby-lang.org/pub/ruby/2.5/ruby-2.5.1.tar.gzruby
tar -zxvf ruby-2.5.1.tar.gz
cd ruby-2.5.1ip
./configureget
makeio
make installmake
ruby --versionwget
cd ..co
wget https://rubygems.org/rubygems/rubygems-2.7.7.zipgem
unzip rubygems-2.7.7.zipconfig
cd rubygemsps
ruby setup.rb