liwh

sudo kill -9 `ps -A|grep memca|awk '{print $1}'` && memcached -m 20 -d

liwh

 history | awk {'print $2'} | sort | uniq -c | sort -k1 -rn | head

liweihui@desktop:~$ history | awk {'print $2'} | sort | uniq -c | sort -k1 -rn | head
     85 cd
     77 git
     74 vim
     68 ls
     22 rm
     20 mv
     14 ruby

liwh

module A
  A.const_set("NUM",2)
end

A::NUM

liwh

#1
file= File.new('filename','w')
file.puts 'aa'
file.close

#2
File.open('filename','w') do |file|
  file.puts 'aa'
end

liwh

自动补全 : esc
查找项目文件:command+t
查找文件内符号:shift+command+t
跳到某行:command+l
选择:shift+方向键
向后缩进:option+tab
向前缩进:shift+option+tab
reformat 所选:option+command+[
大写所选:control+u
小写所选:control+shift+u

liwh

sudo port install mongodb
Password:
--->  Computing dependencies for mongodb
--->  Dependencies to be installed: boost boost-jam libpcap pcre scons spidermonkey nspr
--->  Fetching boost-jam
--->  Attempting to fetch boost-jam-3.1.18.tgz from http://cdnetworks-kr-2.dl.sourceforge.net/boost
--->  Verifying checksum(s) for boost-jam
--->  Extracting boost-jam
--->  Applying patches to boost-jam
--->  Configuring boost-jam

liwh

#测试数据库连接状态：
  My_Model.connection.current_database

liwh

后台启动mongodb:  ./mongod --fork --logpath /var/log/mongodb.log --logappend
关闭mongodb:  $ ./mongo
              > db.shutdownServer()

今天，准备执行rake db:seed时，发现出现:no such file to load --openssl,
 在安装了sudo apt-get install openssl libopenssl-ruby1.9 都没有效果后，此时，从http://openssl.org/ 上下载OpenSSL 0.9.8o 的tar包，自己进行编译安装。步骤如下。
1. tar -xvf openssl*
2. cd openssl*
3. sudo make && sudo make install
4.进入ruby源文件目录，找到/ext/openssl 的目录，进入此目录

liwh

find app -iname '*.rb' | xargs sed -i '1 i\# encoding: utf-8'

liwh

Factory.define :valid_thing, :class => Thing do |t|
  t.name 'Some valid thing'
  t.user { Factory(:valid_user) }
end

Wrapping the call in {} causes Factory Girl to not evaluate the code inside of the 
braces until the :valid_thing factory is created. This will force it to wait until the