From: Rob Biedenharn <Rob@...>
Date: 2009-05-12T05:24:08+09:00
Subject: Re: question to write \4 into file

On May 11, 2009, at 3:47 PM, Cheyne Li wrote:
> 7stud -- wrote:
>> Cheyne Li wrote:
>>> Hi there,
>>>
>>> I have problem with writng "\4" into a file, for example, I want to
>>> write a string "aaa\4024_folder\mm" into a file test.cfg. But once  
>>> the
>>> string wrote into file, it is "aaa024_folder\mm". So, i do this,
>>>
>>> string="aaa\4024_folder\mm"
>>> string=string.sub(/\\4/,"\\4") the result is the same.
>>>
>>> I tried string=string.sub(/\\4/,"\\4"), the result is showed a  
>>> square
>>>
>>> Any one has any idea to solve the problem? Thank you in advance.
>>
>> Use single quotes around your string?
>
> I tried '\4' '\\4' not luck at all
> -- 


as a literal string, you need to escape the \

string = "aaa\\4024_folder\\mm"
File.open('test.cfg', 'a') {|f| f.puts string }

This appends the string to the test.cfg file.

://tmp $ irb
irb> string = "aaa\\4024_folder\\mm"
=> "aaa\\4024_folder\\mm"
irb> File.open('test.cfg', 'a') {|f| f.puts string }
=> nil
irb> exit
://tmp $ cat test.cfg
aaa\4024_folder\mm


-Rob

Rob Biedenharn		http://agileconsultingllc.com
Rob@AgileConsultingLLC.com