--- scripts/buttonpressed.sh.example
+++ scripts/buttonpressed.sh.example
@@ -7,9 +7,28 @@
 #        more scanners. In this case we can pass the device name to SANE programs 
 #        like scanimage.
 
+# *** WARNING ***
+# The example code below contains just simple examples how things may get done.
+# Don't simply uncomment the code on systems with untrusted users!  This would
+# make your button scanning vulnerable to various kinds of attacks by local users.
+# *** WARNING ***
+
 TMPFILE="/tmp/scan.tiff"
+TMPFILE_PDF="/tmp/scan.pdf"
+TMPFILE_PS="/tmp/scan.ps"
 LOCKFILE="/tmp/copy.lock"
 
+# Lock file handling and GNOME examples for buttons 2, 3, 4 below contributed
+# by Lutz Müller <lutz@topfrose.de>.
+
+if ! lockfile-create --retry 2 $LOCKFILE; then
+	echo "Error: scanning already in progress for $2"
+	exit
+fi
+rm -f $TMPFILE
+rm -f $TMPFILE_PDF
+rm -f $TMPFILE_PS
+
 case $1 in
 	1)
 		echo "button 1 has been pressed on $2"
@@ -47,15 +66,39 @@
 		# echo "The print job has been submitted" | festival --tts
 		# rm -f $LOCKFILE
 		#
+
+		# Another example of the same action, but using other tools and
+		# working with newer scanimage versions.
+		# It requires sane-utils, lockfile-progs and netpbm.
+		# Suggested by Francesco Potorti`.
+		#
+		# if ! lockfile-create --retry 2 $LOCKFILE; then
+		#   echo "Error: scanning already in progress for $2"
+		#   exit
+		# fi
+		# SCAN_OPTIONS="--resolution 300 --contrast 10 --brightness 0"
+		# scanimage --verbose --device-name $2 \
+		#           --mode Gray -x 210 -y 297 $SCAN_OPTIONS |
+		#   pnmtops -width=8.27 -height=11.69 |
+		#   lpr -J $2 $PRINTER
+		# lockfile-remove $LOCKFILE
 		;;
 	2)
 		echo "button 2 has been pressed on $2"
+		# flegita
 		;;
 	3)
 		echo "button 3 has been pressed on $2"
+		# scanimage --resolution 300 --device-name $2 --mode Color -x 210 -y 297 | pnmtops -width=8.27 -height=11.69 > $TMPFILE_PS
+		# ps2pdf $TMPFILE_PS $TMPFILE_PDF
+		# evince $TMPFILE_PDF
 		;;
 	4)
 		echo "button 4 has been pressed on $2"
+		# scanimage --resolution 300 --device-name $2 --mode Color -x 210 -y 297 | pnmtops -width=8.27 -height=11.69 > $TMPFILE_PS
+		# ps2pdf $TMPFILE_PS $TMPFILE_PDF
+		# nautilus-sendto $TMPFILE_PDF
 		;;
 esac
 
+lockfile-remove $LOCKFILE