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# bashrc notes

bash 登录会使用`/etc/profile`和`~/.bashrc`,视情况将如下的值保存在对应文件，使之生效。

* man 高亮

  ```bash
  export LESS_TERMCAP_mb=$'\E[01;32m'
  export LESS_TERMCAP_md=$'\E[01;31m'
  export LESS_TERMCAP_me=$'\E[0m'
  export LESS_TERMCAP_se=$'\E[0m'
  export LESS_TERMCAP_so=$'\E[01;44;33m'
  export LESS_TERMCAP_ue=$'\E[0m'
  export LESS_TERMCAP_us=$'\E[04;32m'
  ```

* 支持中文

  ```bash
  export LANG="en_US.UTF-8"
  export LANGUAGE="en_US:en"
  ```
  
* root 账户登录警告

  ```bash
   echo -e "" 
   echo -e "\e[1;31;4m -------- root warning ---------"
   echo -e ""
   echo -e " DO NOT LOGIN USE ROOT ACCOUT!!!"
   echo -e ""
   echo -e "  only run 'sudo' when necessary"
   echo -e ""
   echo -e ""
   echo -e "\e[1;31m -------- root warning ---------"
   echo -e "\e[0m"
   
   PS1='\[\e[01;31m\]\u@\h ROOT WARNING!!!! \[\e[33m\]\w\[\e[32m\]\$\[\e[0m\]'
  ``` 
  
* PS1

  ```bash
  PS1='\[\e[01;31m\]\u@\h\[\e[33m\]\w\[\e[32m\]\$\[\e[0m\]'
  #\u 用户名、\h机器名
  ```  
  
* 设置 terminal tab 标题
 ```bash
 function set-title() {
  if [[ -z "$ORIG" ]]; then
    ORIG=$PS1
  fi
  TITLE="\[\e]2;$*\a\]"
  PS1=${ORIG}${TITLE}
 }
 ``` 

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