前言
之前说过，这个博客系统是用的jekyll搭建的，而Jekyll是用ruby开发的，这就需要一个ruby环境来运行jekyll，虽然自系统搭建以来，没有写过几篇博文，但是运行一直好好的，但是今天发现运行报错了。反复思考原因可能是前两天更新了系统的软件包，导致ruby升级。于是就想到可能以后涉及到版本问题也会很多，所有找了一个环境管理工具。各个语言都有类似的管理工具。
要求
我的对ruby语言了解不多，对这个环境管理工具要求也不高，主要就是可以通过该工具管理ruby各个版本并且方便切换。
选择
经过搜索发现用的比较多的有两个：rvm和rbenv，之所以选择rbenv主要是特别简单，并没有打算用ruby开发的打算，rbenv足够了。
通过帮助查看他们提供的命令就知道这两个的复杂程度相差不少：
1、RVM
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Usage:
rvm [--debug][--trace][--nice] <command> <options>
for example:
rvm list # list installed interpreters
rvm list known # list available interpreters
rvm install <version> # install ruby interpreter
rvm use <version> # switch to specified ruby interpreter
rvm remove <version> # remove ruby interpreter (alias: delete)
rvm get <version> # upgrade rvm: stable, master
Available commands:
rvm has a number of common commands, listed below. Additional information about any command
can be found by executing `rvm help <command>`.
ruby installation
fetch # download binary or sources for selected ruby version
install # install ruby interpreter
list # show currently installed ruby interpreters
list known # list available interpreters
mount # install ruby from external locations
patchset # tools related to managing ruby patchsets
pkg # install a dependency package
reinstall # reinstall ruby and run gem pristine on all gems
remove # remove ruby and downloaded sources (alias: delete)
requirements # installs dependencies for building ruby
uninstall # uninstall ruby, keeping it's sources
upgrade # upgrade to another ruby version, migrating gems
running different ruby versions
current # print current ruby version and name of used gemsets
do # runs a command against specified and/or all rubies
gemdir # display path to current gem directory ($GEM_HOME)
use <version> # switch to given (and already installed) ruby version
use default # switch to default ruby, or system if none is set
use system # switch to system ruby
wrapper # creates wrapper executables for a given ruby & gemset
managing gemsets
gemset # manage gemsets
migrate # migrate all gemsets from one ruby to another
rvm configuration
alias # define aliases for `rvm use`
autolibs # tweak settings for installing dependencies automatically
group # tools for managing groups in multiuser installations
rvmrc # tools related to managing .rvmrc trust & loading gemsets
rvm maintenance
implode # removes the rvm installation completely
cleanup # remove stale source files & data associated with rvm
cron # manage setup for using ruby in cron
docs # tools to make installing ri and rdoc docs easier
get # upgrades RVM to latest head, stable or branched version
osx-ssl-certs # helps update OpenSSL certs installed by rvm on OS X
reload # reload rvm source itself
reset # remove all default and system settings
snapshot # backup/restore rvm installation
troubleshooting
config-get # display values for RbConfig::CONFIG variables
debug # additional information helping to discover issues
export # set temporary env variable in the current shell
fix-permissions # repairs broken permissions
repair # lets you repair parts of your environment, such as
# wrappers, env files and similar (general maintenance)
rubygems # switches version of rubygems for the current ruby
tools # general information about the ruby env
unexport # undo changes made to the environment by `rvm export`
user # tools for managing RVM mixed mode in multiuser installs
information and documentation
info # show the environment information for current ruby
disk-usage # display disk space occupied by rvm
notes # display notes with operating system specifics
version # display rvm version (equal to `rvm -v`)
additional global options
--debug # toggle debug mode on for very verbose output
--trace # toggle trace mode on to see EVERYTHING rvm is doing
--nice # process niceness (increase the value on slow computers, default 0)
2、RBENV
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rbenv 1.2.0
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
install Install a Ruby version using ruby-build
uninstall Uninstall a specific Ruby version
rehash Rehash rbenv shims (run this after installing executables)
version Show the current Ruby version and its origin
versions List installed Ruby versions
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/rbenv/rbenv#readme
安装
rbenv安装起来很简单：
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brew install rbenv ruby-build
使用
使用也是很简单，一共就这几个命令，常用的也就是查看可安装版本、安装、查看已按照版本、切换版本。但是这里面重点需要说一下他有一个初始化操作，我就是因为初始化操作太粗心没有做好，导致切换不了版本，找了好久原因。
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# 初始化
rbenv init
# Load rbenv automatically by appending
# the following to ~/.zshrc:
eval "$(rbenv init - zsh)" # 我就是这里出错了，这个是要写到~/.zshrc文件的，而我没有注意，没有写入
# 列出最新的稳定版本：
rbenv install -l
# 列出所有本地版本：
rbenv install -L
# 安装Ruby版本：
rbenv install 3.1.2
# 查看本地已安装版本
rbenv versions
system # 系统版本
3.1.4
* 3.2.3 (set by /Users/mmy83/.ruby-version) # *代表当前版本
3.3.0
# 切换本地版本
rbenv local 3.1.2
# 切换全局版本
rbenv global 3.1.2
# 撤销本地版本设置
$ rbenv local --unset
RVM问题
不知道为什么，我的电脑上被安装了rvm,然后进入一些目录就会显示没有ruby某个版本，觉得很烦，这里简单记录一下卸载方法。
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rvm implode #需要重新打开命令行，提示就消失了