5. 输出彩色的内容
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# 红色字体
echo -e "\033[31m啦啦啦 \033[0m"
# 白底红字
echo -e "\033[47;31m白底红字内容 \033[0m"
# 白底红字下划线
echo -e "\033[4;31;47m测试内容 \033[0m"
# 下划线
echo -e "\033[4m下划线内容 \033[0m"read -p "`echo -e "\033[44;33m用户名: \033[0m"`" username
read -p "密码:" -s password
echo "你输入的用户名$username"
echo "你输入的密码:$password"