使用Sed抽取MySQL安装文档的目录及行号
sed -nr -e '/^2.|^shell/=' -e '/^2.|^shell/p' INSTALL-SOURCE |awk '{if (NR%2==1) x=$1; else printf "%d\t%s\n",x,$0}'>INSTALL-directory.txt
sed -nr -e '/^2.|^shell/=' -e '/^2.|^shell/p' INSTALL-SOURCE |awk '{if (NR%2==1) x=$1; else printf "%d\t%s\n",x,$0}'>INSTALL-directory.txt