sed -i '$a\Defaults logfile=/var/log/sudo.log' /etc/sudoers

2、替換字符：

sed -i 's/Allow from .example.com/Allow from localhost/g' /usr/local/xxx/config/apache/extra/httpd-info.conf

3、在匹配行下方幾行開始加：

sed -i -e '/location ~ \/\\.ht/{n;n;s|$|\n #-------------------------------------------------|}' /usr/local/xxx/config/nginx/vhost/default.conf

sed -i -e '/location ~ \/\\.ht/{n;n;n;s|$|\n location /nginx-status {|}' /usr/local/xxx/config/nginx/vhost/default.conf

sed -i -e '/location ~ \/\\.ht/{n;n;n;n;s|$|\n stub_status on;|}' /usr/local/xxx/config/nginx/vhost/default.conf

sed -i -e '/location ~ \/\\.ht/{n;n;n;n;n;s|$|\n access_log off;|}' /usr/local/xxx

sed -i -e '/location ~ \/\\.ht/{n;n;n;n;n;n;s|$|\n }|}' /usr/local/xxx/config/nginx/vhost/default.conf

4、刪除匹配性開頭的行：

sed -i '/^Defaults logfile=\/var\/log\/sudo.log.*/d' /etc/sudoers

5、刪除匹配行，並且刪除前一行，後三行：

sed -i '/location \/nginx-status/,+3d;:go;1,1!{P;$!N;D};N;bgo' /usr/local/u-mail/config/nginx/vhost/default.conf

sed實例（持續更新）