创建文件
touch newfile.txt
插入字符串
echo "aaa" >>/newfile.txt
替换字符串
sed -i "s/aaa/ccc/g" `grep aaa -rl /newfile.txt`
touch newfile.txt
echo "aaa" >>/newfile.txt
sed -i "s/aaa/ccc/g" `grep aaa -rl /newfile.txt`
原文：https://www.cnblogs.com/jugglee/p/8434735.html