Re: old burned cd file in wav

That’s also a great method.  Did you mean "find *" or was that supposed to be "find .” to begin the search at the current directory?

I made some tweaks and came up with this Mac-friendly method:

find . -type f -exec shasum -a 256 '{}' \; > sha256.txt
shasum -a 256 -c sha256.txt | grep FAILED

Notes:  
1.  md5sum is not installed by default on the Mac, but shasum is and SHA256 is more robust.
2.  My music directory tree has multiple formats of music as well as ancillary files like cover art, so I opened it up to all files.
3.  I don’t want to see thousands of “OK” lines, so I added the grep for “FAILED”.  I’m hoping I don’t encounter an artist, album, or track name that contains “FAILED”.  :)
4.  Your method with date-specific filenames makes sense, but I was being lazy.
5.  My version assumes that your current working directory (as in ‘pwd’) is the top level of your music directory structure when you start.  The find could be modified to specify that directory.

Thanks, Jerry.

> On Oct 1, 2020, at 1:14 PM, Jerry Baker jbaker6953-/[email protected] [EAC] <[email protected]> wrote:
> 
> I like to do a recursive md5sum (or sha256sum):
> 
> find * -name *.flac -exec md5sum {} ; > flacmd5_20201001.txt
> 
> The resulting file is portable. I can take it to any mirror of my music 
> and use "md5sum -c flacmd5_20201001.txt" to verify that mirror is 
> identical to the other. An added bonus is that it's a snapshot in time 
> so I can verify that the files are the same today as they were last year.
> 
> On 10/1/2020 9:46 AM, Fred Maxwell [email protected] <mailto:[email protected]> [EAC] wrote:
> > diff -rqx '.*’ directory1/ directory2/
> > 
> > {I’m assuming that you have at least two copies of your music collection 
> > and that you have diff}
> > 
> > > so it's very much a deal breaker for me. It took me 18 months to get 
> > all my CDs online, which made me pretty fussy about it.
> > 
> > How many bit flips within FLAC files has your code detected?
> > 
> > If you’re seeing bit flips in files, whether FLAC, executable, OS, or 
> > anything else, you have issues with your storage subsystem that need to 
> > be addressed.
> > 
> > My music (primarily in ALAC) is stored on a eight drive RAID-6 NAS that 
> > performs regular scrubbing (parity checking). I have confidence in the 
> > data integrity of all files stored on that NAS, including the music 
> > files. Of course, that is not my only copy of my music (or any other files).
> > 
> > Regards,
> > Fred Maxwell
> > Moderator, Exact Audio Copy Yahoogroup
> 
>