On Wed, 25 Aug 2021 21:26:19 -0700
Samuel Sieb <sam...@sieb.net> wrote:

> On 8/25/21 9:21 PM, Geoffrey Leach wrote:
> > I have a script that mounts an MP3 device, copies files and
> > umounts. As I have counted on the umount to hang until the data
> > transfer is complete. That has worked fine until recently. Now the
> > umount finishes, leaving much of the data uncopied.  
> 
> You're saying that the copy command has finished and then it runs 
> umount?  umount will certainly wait until the data is flushed.
> What's missing on the destination?  Is the filesystem corrupted?
> 
> > Has some parameter been changed inadvertently? Or was I just lucky,
> > and my luck has run out? If so, is there a way to test for the real
> > end of transfer?  
> 
> You could add a "sync" after the copy and before the "umount".

Just what I needed. Thanks.
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