ruby管理工具rvm

安裝rvm

根據官網（https://www.rvm.io/）顯示，只需執行以下兩條命令即可安裝：

# gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3
# \curl -sSL https://get.rvm.io | bash -s stable

執行完以上兩條命令後會有如下提示：

  * First you need to add all users that will be using rvm to 'rvm' group,
    and logout - login again, anyone using rvm will be operating with `umask u=rwx,g=rwx,o=rx`.

  * To start using RVM you need to run `source /etc/profile.d/rvm.sh`
    in all your open shell windows, in rare cases you need to reopen all shell windows.

# Administrator,
#
#   Thank you for using RVM!
#   We sincerely hope that RVM helps to make your life easier and more enjoyable!!!
#
# ~Wayne, Michal & team.

In case of problems: https://rvm.io/help and https://twitter.com/rvm_io

根據如上提示，需執行，如下命令：

# source /etc/profile.d/rvm.sh

驗證：

# rvm -v
rvm 1.27.0 (latest) by Wayne E. Seguin <[e-mail]>, Michal Papis <[e-mail]> [https://rvm.io/]

rvm安裝ruby

查看ruby集：

# rvm list known  

安裝選定ruby版本：

# rvm install ruby-2.3

通過如上命令，同時也會安裝gem。
使用選定ruby版本：

# rvm use ruby-2.3

設爲默認ruby版本：

# rvm use ruby-2.3 --default

驗證：

# ruby -v
ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-linux]