自己常用的ruby小函数，贴一下

作者：半瓶墨水链接：http://www.2maomao.com/blog/ruby-small-general-procs/

#does ruby guy notice about this pain?
def reverse_slash(str)
   str.gsub(/\//) { |x| "\\" }
end

#double-quote str
def dquote(str)
   "\"#{str}\""
end

#execute and wait for each line
def execute_and_watch(str)
   putsflush " command:#{str}"
   IO.popen(str).each {|line| yield line}
end

#log to the $stderr
def logerr(str)
   #we might need to set the error log file and output log file in the future
   $stderr.putsflush "ERROR! " + str
end

#puts to the $stdout and flush
def putsflush(*str)
   puts *str
   $stdout.flush
end