Roger Pack wrote:
>> So you want to know how much you have written?  Then use #tell
>> http://www.ruby-doc.org/core/classes/IO.html#M002304
>>
>>   robert
> 
> It appears that #tell gives you the size of the file you're writing to, 
> and File#stat.size tells you the filesize of files you're reading from, 
> is that right?

#tell tells you where you're at in the file, not the size of the file. 
If you're in the middle of reading a file, #tell tells you how far you 
are from the start of file. If you seek to offset 100 in a 100,000 byte 
file, #tell returns 100,  not 100,000.

$ ri IO#tell
---------------------------------------------------------------- IO#tell
      ios.pos     => integer
      ios.tell    => integer
------------------------------------------------------------------------
      Returns the current offset (in bytes) of ios.

         f = File.new("testfile")
         f.pos    #=> 0
         f.gets   #=> "This is line one\n"
         f.pos    #=> 17


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