markdown 语法块 # 一级标题 ## 二级标题 * 小标题 sql 语法块 select * from tab where a = b and c = d python 语法块 a = "string" b = 1 c = [1, 2, 3] shell 语法 mkdir ~/script cnt=`ps -ef|grep docker|wc -l` [[ $cnt<0 ]] && echo "123" echo export NLS_LANG='SIMPLIFIED CHINESE_CHINA.ZHS16GBK'>>~/.bashrc