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fix 

```shell
$ stty sane
```

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ctrl-alt-f7

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sudo without password for fangxing

#open this file with sudo visudo -f
/etc/sudoers.d/fangxing
fangxing ALL=(ALL) NOPASSWD:ALL

install

sudo apt-get install -f mysql libmysqlclient-dev redis-server git git-extras \

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快速输入
确保在 ~/.config/fcitx/config 里把 SemiColonAction 修改为 QuickPhrase.
创建 ~/.config/fcitx/data/QuickPhrase.mb, 文件内容示范如下：
 #第一个字符为“#”的行是注释
 #格式：编码 符号
 #数学符号
 
 dianhua 123456789
 youbian 123456
 dizhi 中华人民共和国北京市长安街一号

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#difference between proc and 

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Terminal

• tmux
  • tmuxinator
• git
  • tig
  • diff-so-fancy
• proxy
  • proxychains(proxychains-ng)
  • privoxy
  • tsocks

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+------------+
|permissions |
+-----+------+
      |
   has_many through                   +----+  permission_id
      |          +--------------------+
      +-----^+-> |  role_permissions  |
             |   +--------------------+
          has_many through            +----+  role_id
             +

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# === EDITOR ===
Pry.editor = 'vim'

# == Pry-Nav - Using pry as a debugger ==
Pry.commands.alias_command 'c', 'continue' rescue nil
Pry.commands.alias_command 's', 'step' rescue nil
Pry.commands.alias_command 'n', 'next' rescue nil
Pry.commands.alias_command 'r!', 'reload!' rescue nil

Pry.config.color = true

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$ webpack-dev-server --content-base ./ --port <port> --hot

#检测文件改动webpack 是否察觉 webpack --watch --progress

#如果改动文件(并保存), webpack没有察觉 , 则执行

$ echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p

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Rails Models

Generating models

$ rails g model User

Associations

belongs_to

has_one