STRING="000000000000000;0000000000022222233333;2;NONE;true;100,100,5,1,28;UNKNOWN"
echo $STRING
NUMBERS=$(echo $STRING | cut -d';' -f 6)
SORTSTRING=${NUMBERS//,/\\n}
SORTED=$( echo $(echo -e $SORTSTRING | sed 's/,/\n/' | sort -n ) | sed 's/ /,/g')
STRING2=${STRING/$NUMBERS/$SORTED}
echo $STRING2