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From: Szabolcs Nagy <nsz@port70.net>
Newsgroups: gmane.linux.lib.musl.general
Subject: Re: Musl bug, or, am I losing my mind?
Date: Thu, 31 Dec 2015 04:10:02 +0100
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* Szabolcs Nagy <nsz@port70.net> [2015-12-30 22:28:33 +0100]:
> * Guided Muscle <atguarded-gizmo@yahoo.com> [2015-12-30 20:04:41 +0000]:
> > cat o.txt | cdb -c c.cdb  
> > FAILED: cdb: (stdin): bad format
> > 
> > However 
> > PASS: cdb -c c.cdb < o.txt
> 
> my guess is that cdb does not handle short reads properly
> 
> but you can see what's going on with strace

another guess: if this is a musl based system
then there was a gcc bug that broke fflush at
exit so cat would truncate the output.

again strace can tell if that is the case.