cannot run multiple time simultaneously

sms_send_tosend.sh

@@ -11,6 +11,10 @@ YOU=$(ps auxf --sort=+utime | grep -w ipfs | grep -v -E 'color=auto|grep' | tail
 [[ ! -f /home/${YOU}/.zen/secret.dunikey ]] && echo "Crypto is missing... please install 'astrXbian' TestNet" && exit 1
 G1PUB=$(cat /home/${YOU}/.zen/secret.dunikey | grep 'pub:' | cut -d ' ' -f 2)
 
+ME="${0##*/}"
+countMErunning=$(ps auxf --sort=+utime | grep -w "$ME" | grep -v -E 'color=auto|grep' | wc -l)
+[[ $countMErunning -gt 2 ]] && echo "$ME already running. EXIT." && exit 0
+
 ## STOP GAMMU-SMSD
 sudo service gammu-smsd stop