I forget which small use case I had, but I wanted to view the contents of a qr code. I don't really understand why I would be browsing a website, that wants me to open it up on a mobile browser to continue down an action path. I suppose it's because website/app authors can control a lot more, and read a lot more private info about the user, from a mobile device.
Well, here is my solution for Super+Shift+Q to let me select a region of the screen and pass it to a qr decoder.
files/2026/listings/scrot-qrdecode.sh (Source)
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#!/bin/sh
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# File: scrot-qrdecode.sh
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# Location: https://bgstack15.ddns.net/blog
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# Author: bgstack15
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# SPDX-License-Identifier: AGPL-3.0-only
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# Startdate: 2026-03-24-3 14:06
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# Title: Decode qr Code from Screen
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# Purpose: Grab rectangle from screen, and then display the decoded qr code contents, and offer to put in the clipboard.
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# Project: scrot-qrdecode
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# Usage:
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# A keyboard shortcut, e.g., in ~/.fluxbox/keys
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# Mod4 Shift Q :Exec scrot-qrdecode.sh
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# To generate a qr code that can be scanned with this, run `qrencode "hello dolly" -t utf8 -o -`
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# References:
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# man: zbarimg, scrot, parcellite, xclip
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# https://bbs.archlinux.org/viewtopic.php?id=190572
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# Improve:
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# Alternatives:
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# xmessage: zenity or yad
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# Dependencies:
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# xclip, parcellite, xmessage, scrot zbarimg
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result="$( scrot -s -l 'style=dash,width=1' - | zbarimg -S test-inverted - )"
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# -e 'xclip -selection clipboard -t image/png -i $f'
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xmessage -nearmouse -buttons "OK:1,Copy to clipboard:2" "${result}"
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ec=$?
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if test "${ec}" = "2" ;
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then
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result="$( printf '%s' "${result}" | sed -r -e "s/^QR-Code://;" )"
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# Overkill, because xclip should count. But just to be sure, do it to parcellite directly.
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echo "${result}" | xclip -selection clipboard -t text/plain -in
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echo "${result}" | parcellite
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fi
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Here is a qrcode.
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