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Old 08-23-2012, 07:08 AM   #1
yamanoorsai
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Registered: Jul 2012
Posts: 10

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dialog command buffering problem in pipe


I am trying to pipe percentage values into pipe by the following methods:

Code:
rsync -a --progress ~/Desktop/test.tar.gz ~/Downloads | 
 	unbuffer -p grep -o "[0-9]*%" | 
 	unbuffer -p cut -f1 -d '%'|
        dialog --title "Test" --gauge "Copying file. " 6 100
If you try to copy a file from a DVD, the dialog screen is reset every time and the screen just shows 0%.

I am trying an alternative:
Code:
dialog --title "Test" --gauge "Copying file." 6 100 <<< "$(
 	rsync -a --progress ~/Desktop/version-000.tar.gz ~/Downloads |       unbuffer -p grep -o "[0-9]*%" | 
 	unbuffer -p cut -f1 -d '%'  
	)"
The alternative method is buffering the data and I am not able to display the data immediately. Are there alternatives?
 
Old 08-23-2012, 07:25 AM   #2
414N
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Registered: Sep 2011
Location: Italy
Distribution: Slackware
Posts: 609

Rep: Reputation: 180Reputation: 180
I came across a similar problem when trying to put an mencoder/ffmpeg video conversion progress inside a dialog gauge widget.
You can try it this way (warning: the following script needs polishing):
Code:
rsync  -aP FILE  DEST | while read -d $'\r' INFO
do
	#Retrieve progress %
	progress=$(echo "$INFO" | awk '{print $2}')
	#Remove trail %
	progress=${progress%\%*}
	#Pass the progress % to dialog
	echo $progress | dialog --title "Insert a title here" --gauge "Insert some useful text here" 6 100
done
You'll extract a wrong progress indicator on the first lines of rsync output, but that can be mitigated with appropriate checks on the progress variable.
 
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