Re: Non-printable Bytes in Variable Data

[bmarcum@iglou.com (Bill Marcum)]

On Wed, Dec 06, 2006 at 12:05:52PM -0600, Martin McCormick wrote:
> 	I am working on a  shell script that generates file names
> to use with bladeenc.  Everything works right except that every
> single music file the script creates via bladeenc has a ? or
> question mark preceding the words of the title.  Example: A
> Christmas disk contains a song named "Joy to the World" which
> comes out as a file named "?Joy to the World.mp3".  I don't think
> there is anything wrong with bladeenc because I can manually
> produce "Joy to the World.mp3" with spaces and all by enclosing
> the name of the output file in "" or double quotations.  This
> means my script is sneaking nulls or who knows what else in to
> the variable which I called $songfilename.
> 
> 	Isn't there something I can do in sed along the lines of
> 
> sed '/[[0-9][a-z][A-Z ]]/p'
> 
> to pass only blanks, letters and numbers, but filter out anything
> else?
> 
How does your script create the file names?

> 	The example above is not quite what I need.  It just
> passes everything so what I want is to pass only what matches the
> regular expression.
> 
> 	I did make the shell script print the title with an
> 
> echo $songfilename
> 
> and what it printed looked perfect.
> 
Try this:
echo "$songfilename" | od -to1z


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