Re: how do to cmd subst with trailing newlines portable (was: does POSIX mandate whether the output…)

[Harald van Dijk via austin-group-l at The Open Group]

On 28/01/2022 01:49, Christoph Anton Mitterer wrote:
And hasn't it always been the case that stdout/in can contain arbitrary
binary data?
This is done by gazillions of tools, including such standardised by
POSIX (cat, tr, even printf via \ooo sequences).

Yes, but it has also been the case that not all utilities can process 
arbitrary binary data. There are many utilities that specify input must 
be a text file. One way or another it should be made clear whether that 
is a restriction that also applies to command substitutions.

Cheers,
Harald van Dijk