/usr/bin/kde4 is in kde-runtime 4:17.08.3-0ubuntu1.
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 | #!/bin/sh
#
# Script for launching KDE4 applications from outside of the KDE4 desktop
#
# Modify this to match your specific needs, such as setting up needed env. variables,
# and make sure this script is in $PATH (e.g. make a symlink if necessary).
#
exec "$@"
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