how go run command from file .desktop for super root?

hello

i want to create a file .desktop for me personally then you see my code, i will wanted to free (clear) cache in memory
use comand:

su
[password root]
echo 1 > /proc/sys/vm/drop_caches

this is worked to clear cache in memory
then i create .desktop for me:

[Desktop Entry]
Comment[it]=
Comment=
Exec=su echo > 1 /proc/sys/vm/drop_caches
GenericName[it]=
GenericName=
Icon=media-flash
MimeType=
Name[it]=
Name=
Path=
StartupNotify=true
Terminal=false
TerminalOptions=
Type=Application
X-DBUS-ServiceName=
X-DBUS-StartupType=
X-KDE-SubstituteUID=false
X-KDE-Username=

this not worked… where i’m wrong code?
or file .sh? it’s can work?

thank you

See if the following bash script works for you. Copy the text from the following code field and save it in your local bin folder as $HOME/bin/vmfix

#!/bin/bash

#: Title       : vmfix
#: Date Created: Sat Aug 17 18:46:47 CDT 2013
#: Last Edit   : Sat Aug 17 18:46:47 CDT 2013
#: Author      : https://forums.opensuse.org/members/manuel_songokuh.html
#: Version     : 1.00
#: Description : 
#: Options     : 

# *****************************************************************************
#                Check to see if vmfix was started as Root 
# *****************************************************************************

function check_uid {
  if  $UID != 0 ] ; then
    clear
    echo -n "vmfix Requires Root User Authority.  Please Enter "
    sudo $0
    Exit_Command=$?
  else
    clear
    echo -n "Executing the command: echo > 1 /proc/sys/vm/drop_caches"
  fi
  return 0
}

check_uid

echo > 1 /proc/sys/vm/drop_caches

exit 0

# End Of Script


To use it, it must be marked as executable with this terminal command:

chmod +x $HOME/bin/vmfix

To test, from the same terminal session just type in:

vmfix

You could then use the following $HOME/Desktop/VM-FIX.desktop file:

[Desktop Entry]
Comment[en_US]=
Comment=
Exec=$HOME/bin/vmfix
GenericName[en_US]=VM Fix
GenericName=VM Fix
Icon=yast-vm-install
MimeType=
Name[en_US]=VM-FIX
Name=VM-FIX
Path=
StartupNotify=false
Terminal=true
TerminalOptions=
Type=Application
X-DBUS-ServiceName=
X-DBUS-StartupType=none
X-KDE-SubstituteUID=false
X-KDE-Username=

Thank You,