Re: bash command substitution

[Marco Atzeri <marco.atzeri@gmail.com>]

On 01/10/2017 08:40, Vukovics Mihaly wrote:
> Hello All,
> 
> 
> I just wanted to use my bash script written in Debian 8 in 
> cygwin(latest, win10 64bit), but does not work.
> At a specific line there is a command substitution trying to get result 
> from ffprobe:
> 
> 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?
> 
> Code:
> 
> ...
> declare -i VHEIGHT
> ffprobe -v error -show_entries stream=width,height -of 
> default=noprint_wrappers=1 ${OLDFILE} | grep height | cut -f2 -d'='
> VHEIGHT=$(ffprobe -v error -show_entries stream=width,height -of 
> default=noprint_wrappers=1 ${OLDFILE} | grep "height" | cut -f2 -d'=')
> ...
> 
> Here is some debug log (set -x):
> 
> ....
> + declare -i VHEIGHT
> + ffprobe -v error -show_entries stream=width,height -of 
> default=noprint_wrappers=1 P1220312.MP4
> + grep height
> + cut -f2 -d=
> 2160              # this woudl be the desired value
> + VHEIGHT=        # here the variable is empty!
> + VIDSTABDETECTOPTS=:shakiness=10
> + VIDSTABDETECTOPTS+=:result=P1220312-stab.trf
> + VIDSTABTRANSFORMOPTS+=:crop=keep
> 
> ....
> 
> The same in Linux bash:
> 
> ...
> + declare -i VHEIGHT
> + ffprobe -v error -show_entries stream=width,height -of 
> default=noprint_wrappers=1 P1220312.MP4
> + grep height
> + cut -f2 -d=
> 2160
> ++ ffprobe -v error -show_entries stream=width,height -of 
> default=noprint_wrappers=1 P1220312.MP4
> ++ grep height
> ++ cut -f2 -d=
> + VHEIGHT=2160     # here is the desired value in the variable!!!
> ...
> 
> Any suggestions?
> 

from where ffprobe is coming for ?

  $ cygcheck -p ffprobe
Found 0 matches for ffprobe

If it is a windows program, may it is due to CRLF emitted instead of LF



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