/usr/bin/sugar is in sugar-session-0.86 0.86.3-16.
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 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 | #!/bin/sh
usage() {
    cat <<EOF
Usage: sugar [OPTION]..
Start Sugar window manager.
Optional arguments.
  -d, --display DISPLAY     Display to start sugar
  -s, --scaling SCALING     Scale Sugar theme
                            Supported values: 72, 100
EOF
    exit 0
}
while [ $# -ne 0 ] ; do
    case "$1" in
      	-d | --display)
            shift
            export DISPLAY="$1"
            ;;
      	-s | --scaling)
            shift
            export SUGAR_SCALING="$1"
            ;;
      	-h | --help)
            usage
            ;;
    esac
    shift
done
if test -z "$SUGAR_SCALING"; then
    export SUGAR_SCALING=72
fi
export GTK2_RC_FILES="/usr/share/sugar/data/sugar-$SUGAR_SCALING.gtkrc"
# Needed for executing wpa_passphrase
export PATH="$PATH":/sbin:/usr/sbin
if ! test -f "$GTK2_RC_FILES"; then
    echo "sugar: ERROR: Gtk theme for scaling $SUGAR_SCALING not available in path $GTK2_RC_FILES"
    exit 1
fi
# Source debug definitions
if [ -f ~/.sugar/debug ]; then
        . ~/.sugar/debug
fi
echo Xcursor.theme: sugar | xrdb -merge
metacity --no-force-fullscreen -d $DISPLAY &
exec sugar-session
 |