change how telegraf script determine if there is already and instance of the script already running

salt/telegraf/scripts/influxdbsize.sh

@@ -15,13 +15,12 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-THEGREP=$(ps -ef | grep $0 | grep -v $$ | grep -v grep)
-
-if [ ! "$THEGREP" ]; then
+# if this script isn't already running
+if [[ ! "`pidof -x $(basename $0) -o %PPID`" ]]; then
 
     INFLUXSIZE=$(du -s -k /host/nsm/influxdb | awk {'print $1'})
-
     echo "influxsize kbytes=$INFLUXSIZE"
-else
-    exit 0 
-fi
+    
+fi
+
+exit 0