Automatically open a screenshot for viewing after it is taken and delete after it is closed. Requires inotify-tools. This is written and tested on Gnome with Shotwell, probably can be adapted to other systems by changing the screenshot filename pattern (line 16) and the photo viewing application (line 18).

auto-open-screenshot.sh

#!/bin/bash

if [[ -z "$1" ]]; then
  _monitor_dir="$HOME/Pictures"
else
	_monitor_dir="$1"
fi
if [[ ! -d "${_monitor_dir}" ]]; then
	echo "Can't find directory '${_monitor_dir}', does it exist?"
	exit 1
fi

inotifywait -m -e create --format '%f' "${_monitor_dir}" \
	| while read file; do

	if [[ "$file" = Screenshot\ from\ * ]]; then
		echo "File created: '$file'"
		shotwell "${_monitor_dir}/$file"
		rm -f "${_monitor_dir}/$file"
	fi
done