linux 查找文件的BOM头

1.查找文件BOM头，\xef\xbb\xbf是UTF8 BOM的16进制表示

[root@php-node01 wwwroot]# grep -r -I -l $'^\xEF\xBB\xBF' ./
./v2.5/web/vendor/ezyang/htmlpurifier/INSTALL.fr.utf8
./v2.5/web/vendor/yiisoft/yii2/messages/az/yii.php
./v2.5/wap/vendor/ezyang/htmlpurifier/INSTALL.fr.utf8
./v2.5/wap/vendor/yiisoft/yii2/messages/az/yii.php
./v2.51/web.news_14_v5/vendor/ezyang/htmlpurifier/INSTALL.fr.utf8
./v2.51/web.news_14_v5/vendor/yiisoft/yii2/messages/az/yii.php
./v2.51/web.service_37_v50/vendor/yiisoft/yii2/messages/az/yii.php
./v2.51/web.news_13_v5/vendor/ezyang/htmlpurifier/INSTALL.fr.utf8
./v2.51/web.news_13_v5/vendor/yiisoft/yii2/messages/az/yii.php
./v2.51/web.service/vendor/yiisoft/yii2/messages/az/yii.php
./v2.51/web.service_36_v50/vendor/yiisoft/yii2/messages/az/yii.php
./v2.51/web.news/vendor/ezyang/htmlpurifier/INSTALL.fr.utf8
./v2.51/web.news/vendor/yiisoft/yii2/messages/az/yii.php
./v2.51/wap/vendor/ezyang/htmlpurifier/INSTALL.fr.utf8
./v2.51/wap/vendor/yiisoft/yii2/messages/az/yii.php

 2.清除文件BOM头并检验

[root@php-node01 wwwroot]# find . -type f -exec sed -i 's/\xEF\xBB\xBF//' {} \;
[root@php-node01 wwwroot]# grep -r -I -l $'^\xEF\xBB\xBF' ./