lanrion

bundle 在安装gem时，在默认的情况下，是会下载安装gem附带的ri与rdoc，gem安装的越多，那么rdoc就会占用了我们大量的硬盘空间；配置如下：

vim ~/.gemrc
# 添加如下即可
gem: --no-ri --no-rdoc

赞！

lanrion

导出：
mysqldump -uroot db_name > tmp/db_name

导入：

进入mysql数据库控制台,
如mysql -u root -p
mysql>use 数据库;
然后使用source命令,后面参数为脚本文件(如这里用到的.sql)
mysql>source SQL的文件目录;

lanrion

https://help.github.com/articles/generating-ssh-keys

ssh-keygen -t rsa -C "[email protected]"

eval `ssh-agent -s`

lanrion

netstat -nltp

lanrion

貌似最新版本的依赖安包包，还是挺多的。

http://nokogiri.org/tutorials/installing_nokogiri.html

If this is a concern for you and you want to use the system library instead, abort this installation process and reinstall nokogiri as follows:

gem install nokogiri -- --use-system-libraries

lanrion

lanrion dummy (master) $ 4rs 
bin/rails:6: warning: already initialized constant APP_PATH
/Users/lanrion/Projects/mygems/retrench/test/dummy/bin/rails:6: warning: previous definition of APP_PATH was here
Error: Command '-p' not recognized
Usage: rails COMMAND [ARGS]

The most common rails commands are:
 generate    Generate new code (short-cut alias: "g")
 console     Start the Rails console (short-cut alias: "c")

lanrion

https://github.com/harrisj/qrencoder

依赖包
for ubuntu
sudo apt-get install qrencode libqrencode-dev
gem install qrencoder

for mac
brew install qrencode
gem install qrencoder -- --  with-qrencoder-include=/usr/local/Cellar/qrencode/3.4.3_1/include --with-qrencoder-lib=/usr/local/Cellar/qrencode/3.4.3_1/lib

lanrion

有一个简单的需求：

数据库有一个表User（id, name），需要导出：

 {
   id1 => name1,
   id2 => name2
 }

lanrion

http://git-scm.com/book/en/Git-Basics-Tagging

git tag -a v1.5 -m 'my version 1.5'

git push origin v1.5

lanrion

I run this command to find and replace all occurrences of 'apple' with 'orange' in all files in root of my site

find ./ -type f -exec sed -i -e 's/apple/orange/g' {} \;