如何比较shell脚本中的十进制数？

#!/bin/bash
for input in $(cat status_cpu.txt)
do
      cpu=`ssh -i  root@$input 'top -b -n1' | grep "load" | awk '{print }'`

      max=2.02

if [ $(echo "$cpu < $max" | bc -l ) ]; then
    echo "yes"
else
    echo "no" 
fi
done  
#!/bin/bash
for input in $(cat status_cpu.txt)