Piping to another program in the middle of a oneliner

I'm trying to create a simple bash one line script that allows me to pick a particular barcode that's visible on my screen and make it available as text on my clipboard. To that effect, I wrote a bash script that aims to capture a part of the screen with gnome-screenshot into a PNG file, inspect that file with zbarimg and make whatever it outputs available to be pasted with xclip. Here's what I wrote: tfile=$(mktemp -u -p ~).png && gnome-screenshot -a -f $tfile && zbarimg -q --raw $tfile | xclip; rm $tfile Just after I run this script it does request me to capture a part of the screen (exactly what gnome-screenshot is supposed to do), the screenshot file is created, but after that it seems that xclip runs and waits for input forever, as if zbarimg didn't output anything. Does anyone have a suggestion to solve this issue?