install rbenv on centos 7

install-rbenv.sh

#!/bin/bash

prog=${0##*/}

function usage ()
{
    cat << EOF
NAME
    $prog - Install rbenv.

SYNOPSIS
    $prog [OPTIONS]

DESCRIPTION
    A bash script for install rbenv.

OPTIONS
    -h              - show this help or help for a subcommand
    -i              - install centos depends with sudo
    -d              - development mode
    -c              - use china mirror
    -v ruby_version - ruby version to install

EOF
}

while getopts "idcv:h" opt
do
    case "$opt" in
        i) INSTALL_DEPS=1 ;;
        d) DEVELOPMENT=1 ;;
        c) CHINA_MIRROR=1 ;;
        v) RUBY_VERSION="${OPTARG}" ;;
        h|*) usage; exit 1 ;;
    esac
done

RUBY_VERSION=${RUBY_VERSION:-2.5.0}

cd ~

if [ "${INSTALL_DEPS}" -eq 1 ]; then
    # install build dependencies
    sudo yum install -y git-core zlib zlib-devel gcc-c++ patch readline readline-devel libyaml-devel libffi-devel openssl-devel make bzip2 autoconf automake libtool bison curl sqlite-devel
fi

# clone and install rbenv environment
git clone git://github.com/sstephenson/rbenv.git ~/.rbenv
echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bash_profile
echo 'eval "$(rbenv init -)"' >> ~/.bash_profile

# re-init bash
source ~/.bash_profile

# 用来编译安装 ruby
git clone git://github.com/sstephenson/ruby-build.git "$(rbenv root)"/plugins/ruby-build
if [ "${CHINA_MIRROR}" -eq 1 ]; then
    # 使用 Ruby China 的镜像安装 Ruby, 国内用户推荐
    git clone https://github.com/andorchen/rbenv-china-mirror.git "$(rbenv root)"/plugins/rbenv-china-mirror
fi
if [ "${DEVELOPMENT}" -eq 1 ]; then
    # 通过 gem 命令安装完 gem 后无需手动输入 rbenv rehash 命令, 推荐
    git clone git://github.com/sstephenson/rbenv-gem-rehash.git "$(rbenv root)"/plugins/rbenv-gem-rehash
    # 通过 rbenv update 命令来更新 rbenv 以及所有插件, 推荐
    git clone git://github.com/rkh/rbenv-update.git "$(rbenv root)"/plugins/rbenv-update
fi

# install latest ruby
rbenv install -v $RUBY_VERSION
# sets the default ruby version that the shell will use
rbenv global $RUBY_VERSION

if [ "${CHINA_MIRROR}" -eq 1 ]; then
    gem sources --add https://gems.ruby-china.org/ --remove https://rubygems.org/
fi

if [ "${DEVELOPMENT}" -ne 1 ]; then
    # to disable generating of documents as that would take so much time
    echo "gem: --no-document" > ~/.gemrc
fi

# install bundler
gem install bundler

# must be executed everytime a gem has been installed in order for the ruby executable to run
rbenv rehash

if [ "${CHINA_MIRROR}" -eq 1 ]; then
    bundle config mirror.https://rubygems.org https://gems.ruby-china.org
fi