去除UTF8文件开头的BOM信息

no-UTF8-BOM.rb

#!/usr/bin/env ruby -w
# -*- coding: UTF-8 -*-

# 去除UTF8文件开头的BOM信息

# usage: cat file | ruby no-UTF8-BOM.rb
# or:    ruby no-UTF8-BOM.rb file

content = ''
if ARGV.length > 0 then
  # 参数模式
  File.open(ARGV[0], "r") do |file|
    content = file.read.force_encoding("UTF-8")
  end
else
  # 管道模式
  content = STDIN.read.force_encoding("UTF-8")
end
puts content.gsub!("\xEF\xBB\xBF".force_encoding("UTF-8"), '')