缺少命令rbenv install

Question

在Ubuntu 10.04中，我刚刚安装了rbenv。安装命令不存在。

rbenv 0.4.0-49-g8b04303
Usage: rbenv <command> [<args>]

Some useful rbenv commands are:
   commands    List all available rbenv commands
   local       Set or show the local application-specific Ruby version
   global      Set or show the global Ruby version
   shell       Set or show the shell-specific Ruby version
   rehash      Rehash rbenv shims (run this after installing executables)
   version     Show the current Ruby version and its origin
   versions    List all Ruby versions available to rbenv
   which       Display the full path to an executable
   whence      List all Ruby versions that contain the given executable

See `rbenv help <command>' for information on a specific command.
For full documentation, see: https://github.com/sstephenson/rbenv#readme

我遗漏了什么？

Answer 1

install命令没有嵌入到rbenv中，它来自ruby-build插件。您可以使用以下命令进行安装：

git clone https://github.com/rbenv/ruby-build.git "$(rbenv root)"/plugins/ruby-build

在Mac上，你可以通过homebrew安装它：

brew install ruby-build

在Debian (版本>= 7)和Ubuntu (版本>= 12.10)上，都可以使用apt-get (或aptitude)安装rbenv和ruby-build：

sudo apt-get update
sudo apt-get install rbenv ruby-build

在FreeBSD上，ruby-build在端口集合中可用，它既可以作为二进制包安装，也可以从端口构建：

# Using pkgng rbenv will be installed
pkg install ruby-build

# Building ruby-build form Ports will install rbenv only if the RBENV option is set
cd /usr/ports/devel/ruby-build
make install

Answer 2

我发现当从全局目录使用rbenv时，有必要导出RBENV_ROOT变量，否则它不会加载插件。

export RBENV_ROOT="/usr/local/rbenv"
if [ -d "${RBENV_ROOT}" ]; then
  export PATH="${RBENV_ROOT}/bin:${PATH}"
fi

Answer 3

正如每个人都提到的那样，问题是缺少ruby-build。对于较旧版本的操作系统，ruby-build可能无法作为apt软件包提供。在这种情况下，使用original instructions安装，它应该在下面的代码中省略单词Optional：

1. (可选)安装ruby-build，它提供了rbenv Install命令来简化安装新Ruby版本的过程。

git clone git@github.com:rbenv/ruby-build.git ~/.rbenv/plugins/ruby-build
# OR use http
git clone https://github.com/rbenv/ruby-build.git ~/.rbenv/plugins/ruby-build