Setup RVM on Mac OS X

First of all, install Xcode in anyway.
Installing rvm itself is pretty easy. The rvm homepage gives a quick
install command:

bash < <(curl -s
https://raw.github.com/wayneeseguin/rvm/master/binscripts/rvm-installer)

and then add this to your shell profile:

[[ -s "$HOME/.rvm/scripts/rvm" ]] && . "$HOME/.rvm/scripts/rvm"
CC=/usr/bin/gcc-4.2

For ruby 1.9.3, we need libksba installed, using Homebrew, just run

'brew install libksba'

installing Homebrew is quite easy too:

/usr/bin/ruby -e "$(curl -fsSL https://raw.github.com/gist/323731)"

now try install ruby 1.9.3:

rvm install 1.9.3 --reconfigure --debug -C --enable-pthread --with-gcc=clang

NOTE: in case of any compilation issues
* downgrade to Xcode 4.1
* or install osx-gcc-installer
and reinstall your rubies.

Setup Git on Mac OS X

1. Check this out http://code.google.com/p/git-osx-installer/ *Don't worry if it's a Snow Leopard version, it works on Lion!
   
2. Double click to mount it.
3. Run the git-1.x.x.x-x.pkg (A basic installer. Note: You'll need administrative privileges.)
4. Complete the Installation
5. Open up a terminal
   1. Change directories to the mounted image
      bash$ cd /Volumes/Git\ 1.x.x.x\ xx/
      
   2. Run the shell script (bash$ ./setup\ git\ PATH\ for\ non-terminal\ programs.sh)

Re-open your terminal (reset your session) and you'll be good to go. Up and running with Git in no time!

[转] 最大化Dropbox的免费空间

Dropbox免费的2G空间虽然已经可以存不少东西了，但是对于同步控而言，显然还是太少，但是花钱的话，只有50G和100GB两个选择，又太贵了点儿。本文介绍了一些方式，可以将Dropbox的免费空间直接提升到4G以上，并且最多可以有20G+，有兴趣的同学千万别错过。

1. 使用别人的邀请链接注册，这样就是2.25G，否则只有2G。我的Referer链接： http://db.tt/MQB4KVy

2. 安装Dropbox客户端，然后完成Get Started教程里的五六步，获得256M免费空间 https://www.dropbox.com/gs

3. 获得额外的5×128M免费空间 https://www.dropbox.com/free
(1) 绑定Twitter帐户 - 128MB
(2) 绑定Facebook帐户 - 128MB
(3) 在twitter上Follow @Dropbox - 128MB
(4) 写出一句话说明为什么你喜欢Dropbox - 128MB
(5) 把那句话Tweet出去（就是发到twitter上） - 128MB

4. 邀请其他人，每个人可以给你增加256MB空间。

5. 如果你有.edu、.edu.cn等邮箱（学生或者老师，比如武大的@mail.whu.edu.cn就行），访问https://www.dropbox.com/edu 绑定edu邮箱，就可以将每次邀请的量增加，由256增加到512，邀请能获得的最大空间也会翻倍到16G。步骤1的256也会变成512。