linux批量修改文件内容--脚本

#!/bin/bash
old="$1"
new="$2"
for item in $(find -name "*.php" -exec  awk '/Louis\/Site.css/{print FILENAME}' {} \;)
do
    backup="${item}.bak"
    cp -f "$item" "$backup"
    sed -e s/$old/$new/g $backup >$item
 rm -rf $backup
done