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The parse error comes from "bc". The script executes
echo ' 6.7% us > 6.0% us 6.1% us 6.2% us 6.3% us 6.5% us 6.6% us 6.7% us 6.8% us 6.9% us 7.0% us' | bcwhich is not a correct input for "bc". On...

If your not on linux try looking at uptime for a quick summary of load, or sar -u 2 1

If you are on linux it's better to see load average from /proc/loadavg. You can do it something like this:
while true; do
loadavg=`cat /proc/loadavg`
sleep 1 # or some other time
# do...