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