Ruby on RVM

RVM 的全名是 ruby version manager，是一套用來管理 ruby 版本的套件。Ubuntu 預設就有安裝 ruby 且系統會使用，而 ruby 每個版本可能存在蠻大的差異，如果在系統上安裝許多版本的 ruby ，會讓系統感覺很混亂，移除又擔心影響系統穩定度，這時用 rvm 再好也不過了！

在安裝 rvm 之前，系統上必需要有一套 ruby，不過 ubuntu 預設就安裝了，很好 :D

參考安裝手冊：

$ sudo apt-get install curl git-core

$ bash < <(curl -s https://rvm.beginrescueend.com/install/rvm)

完成後，系統會告訴我們一些訊息，如下：

Notes for Linux ( DISTRIB_ID=Ubuntu

DISTRIB_RELEASE=8.04

DISTRIB_CODENAME=hardy

DISTRIB_DESCRIPTION="Ubuntu 8.04.4 LTS" )

NOTE: 'ruby' represents Matz's Ruby Interpreter (MRI) (1.8.X, 1.9.X)

This is the *original* / standard Ruby Language Interpreter

'ree' represents Ruby Enterprise Edition

'rbx' represents Rubinius

bash >= 3.2 is required

curl is required

git is required (>= 1.7 recommended)

patch is required (for ree and some ruby-head's).

If you wish to install rbx and/or Ruby 1.9 head (MRI) (eg. 1.9.2-head),

then you must install and use rvm 1.8.7 first.

If you wish to have the 'pretty colors' again,

set 'export rvm_pretty_print_flag=1' in ~/.rvmrc.

dependencies:

# For RVM

rvm: bash curl git

# For Ruby (MRI & ree) you should install the following OS dependencies:

ruby: /usr/bin/aptitude install build-essential bison openssl libreadline6 libreadline6-dev curl git-core zlib1g zlib1g-dev libssl-dev libyaml-dev libsqlite3-0 libsqlite3-dev sqlite3 libxml2-dev libxslt-dev autoconf libc6-dev

# For JRuby (if you wish to use it) you will need:

jruby: /usr/bin/aptitude install curl g++ openjdk-6-jre-headless

jruby-head: /usr/bin/aptitude install ant openjdk-6-jdk

# In addition to ruby: dependencies,

ruby-head: subversion

# For IronRuby (if you wish to use it) you will need:

ironruby: /usr/bin/aptitude install curl mono-2.0-devel

You must now complete the install by loading RVM in new shells.

1) Place the folowing line at the end of your shell's loading files

(.bashrc or .bash_profile for bash and .zshrc for zsh),

after all PATH/variable settings:

[[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm" # This loads RVM into a shell session.

You only need to add this line the first time you install rvm.

2) Ensure that there is no 'return' from inside the ~/.bashrc file,

otherwise rvm may be prevented from working properly.

This means that if you see something like:

'[ -z "$PS1" ] && return'

then you change this line to:

if [[ -n "$PS1" ]] ; then

# ... original content that was below the '&& return' line ...

fi # <= be sure to close the if at the end of the .bashrc.

# This is a good place to source rvm v v v

[[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm" # This loads RVM into a shell session.

EOF - This marks the end of the .bashrc file

Be absolutely *sure* to REMOVE the '&& return'.

If you wish to DRY up your config you can 'source ~/.bashrc' at the bottom of your .bash_profile.

Placing all non-interactive (non login) items in the .bashrc,

including the 'source' line above and any environment settings.

3) CLOSE THIS SHELL and open a new one in order to use rvm.

WARNING: you have a 'return' statement in your ~/.bashrc

This could cause some features of RVM to not work.

This means that if you see something like:

'[ -z "$PS1" ] && return'

then you change this line to:

if [[ -n "$PS1" ]] ; then

# ... original content that was below the '&& return' line ...

fi # <= be sure to close the if at the end of the .bashrc.

# This is a good place to source rvm v v v

[[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm" # This loads RVM into a shell session.

EOF - This marks the end of the .bashrc file

Even if you are using zsh you should still adjust the ~/.bashrc

If you have any questions about this please visit

#rvm on irc.freenode.net.

Installation of RVM to /home//.rvm/ is complete.

Thank you very much for using RVM! I sincerely hope that RVM helps to

make your work both easier and more enjoyable.

If you have any questions, issues and/or ideas for improvement please

join#rvm on irc.freenode.net and let me know, note you must register

(http://bit.ly/5mGjlm) and identify (/msg nickserv ) to

talk, this prevents spambots from ruining our day.

My irc nickname is 'wayneeseguin' and I hang out in #rvm typically

~09:00-17:00EDT and again from ~21:00EDT-~23:00EDT

If I do not respond right away, please hang around after asking your

question, I will respond as soon as I am back. It is best to talk in

#rvm itself as then other users can help out should I be offline.

Be sure to get head often as rvm development happens fast,

you can do this by running 'rvm get head' followed by 'rvm reload'

or opening a new shell

w⦿‿⦿t

~ Wayne

這些資訊是要閱讀的，不可以忽略，它會提示我們有哪些相依的套件是需要安裝和設定。

以 install ruby 來說，它告訴我們需要做：

# /usr/bin/aptitude install build-essential bison openssl libreadline6 libreadline6-dev curl git-core zlib1g zlib1g-dev libssl-dev libyaml-dev libsqlite3-0 libsqlite3-dev sqlite3 libxml2-dev libxslt-dev autoconf libc6-dev

然後在 ~/.bashrc 把下面這一行加進去

[[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm" # This loads RVM into a shell session.

都完成之後，以後只要透過 rvm 就可以輕易切換 ruby 版本了！