Tool for testing how often a command succeeds

testCall.sh

#!/bin/bash

CMD="$@"

declare -i COUNT
declare -i SUCCESS
SUCCESS=0
COUNT=0

for i in {1..100}; do
    echo -n "${i}: Running command '$@'... "
    eval "$@" > /dev/null 2>&1 
    RES=$?
    if [ $RES -eq 0 ]; then
        SUCCESS=$(echo $SUCCESS + 1 | bc)
        echo "Success"
    else
        echo "Failed"
    fi
    COUNT=$(echo $COUNT + 1 | bc)
done

AVG=$(echo $SUCCESS $COUNT | awk '{printf "%.1f", $1 / $2 * 100}')
echo "Success rate: ${AVG} ($SUCCESS times out of $COUNT)"