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Re: bash command substitution




Try the following:

echo $(echo hello | cat)

If that remains empty, (it should of course result in 'hello') you're
suffering from the same problem I have. And no, I did not get it resolved.
In which case I'd be elated if you could get anyone interested in finding a
solution!

If this happens to you, too, then the problem is that the pipe in a
subshell simply does not work. For the vast majority, it DOES work.

On 1 October 2017 at 18:01, Steven Penny <svnpenn@xxxxxxxxx> wrote:

> On Sun, 1 Oct 2017 08:40:51, Vukovics Mihaly wrote:
>
>> VHEIGHT=$(ffprobe -v error -show_entries stream=width,height -of
>> default=noprint_wrappers=1 ${OLDFILE} | grep "height" | cut -f2 -d'=')
>>
>> For debugging purpose the same command is executed without putting the
>> result into a variable, and works! Does anyone know why is it not working
>> in cygwin?
>>
>
> I am not having this trouble:
>
>    $ VHEIGHT=$(ffprobe -v 0 -of compact=p=0:nk=1 -select_streams 0 \
>    -show_entries stream=height 'The Master (2012).mp4')
>
>    $ echo "$VHEIGHT"
>    1040
>
> but as Marco said, you might need to sanitize for carriage returns:
>
>    $ echo "$VHEIGHT" | od -tcx1
>    0000000   1   0   4   0  \r  \n
>             31  30  34  30  0d  0a
>
>
>
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