sed in shell script

sed: -e expression #1, char 14: unknown option to `s'

line="Include /2"
rep=""
sed -e "s/${line}/${rep}/g" /root/new_scripts/a.conf

sed -e "s|${line}|${rep}|g" /root/new_scripts/a.conf 

References :

bash - replace a string in file using shell script - Stack Overflow

Linux sed 修改登錄記錄

sed -s 's/211.xxx.xxx.xxx/192.168.1.1/g' access_log access.log  security

Reference :
some shit tips | 鬼仔's Blog

sed 使用變數 (variable) 取代

$ sed -i 's,PATH=.*,PATH='"$DIR"',g' appcfg.ini

新增文字至檔案第1行

$ for i in `ls`; do sed -i 1i"xxx" $i; done