/usr/share/nautilus-scripts/Subversion/Diff is in nautilus-script-collection-svn 0.9.2-0ubuntu3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | #!/bin/bash
#
# Distributed under the terms of GNU GPL version 2
#
# http://marius.scurtescu.com/?p=102
# http://gnomefiles.org/app.php?soft_id=1059
LOGFILE=`mktemp -t svn_diff.XXXXXX`
svn diff "$@" &> $LOGFILE
zenity --text-info --title="Subversion: Diff" --filename=$LOGFILE --width=600 --height=400 --window-icon="`dirname $0`/svn.xpm"
rm -f $LOGFILE
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