ubuntu - Linux环境下如何将utf-8格式文件转变成无bom的utf-8格式文件？

基于Octopress搭建的博客，使用rake generate生成博客的时候会报如下的错误：

## Generating Site with Jekyll
identical source/stylesheets/screen.css 
Configuration from /srv/octopress/_config.yml
Building site: source -> public
Liquid Exception: incompatible encoding regexp match (ASCII-8BIT regexp with UTF-8 string) in page
/srv/octopress/plugins/category_list_tag.rb:9:in `gsub'
/srv/octopress/plugins/category_list_tag.rb:9:in `block in render'
/srv/octopress/plugins/category_list_tag.rb:6:in `each'
/srv/octopress/plugins/category_list_tag.rb:6:in `render'

参阅了网上的一些说明，是因为utf-8格式格式造成的，所以请问Linux环境下如何将utf-8格式文件转变成无bom的utf-8格式文件？