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  • 赋值 var=value
  • 相等 var = value
  • 查看PID pgrep gedit
  • 替换 cat /proc/12501/environ | tr '\0' '\n'
  • 引用变量 echo $var 或者 echo ${var}
  • 获取长度 echo ${#var}
  • 临时变量 HTTP_PROXY=http://192.168.0.2:3128 export HTTP_PROXY
  • 环境变量 $PATH
  • 增加环境变量 export PATH="$PATH:/home/user/bin"
  • $PATH通常定义在 /etc/environment | /etc/profile | ~/.bashrc
  • 常用环境变量:HOME PWD USER UID SHELL PS1
  • 判断是否超级用户
if [$UID -ne 0];then
echo Non root user. Please run as root
else 
echo "Root user"
fi
  • 输出颜色文字
echo  "\e[1;42mI love you,赵丹\e[0m这里是天堂!"  #背景
echo "\033[37;31;;5mMySQL Server Stop...\033[39;49;0m" # 闪烁
echo -e "\033[37;31;1mMySQL Server Stop...\033[39;49;0m" # 加粗
echo -e "\033[37;31;4mMySQL Server Stop...\033[39;49;0m" # 下划线
echo -e "\033[37;31;7mMySQL Server Stop...\033[39;49;0m" # 反显
echo -e "\033[37;31;8mMySQL Server Stop...\033[39;49;0m" # 隐匿

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