shell 小数

#!/bin/bash
RECORD_TIME=`date '+%Y-%m-%d---%H-%M-%S'`
#获取现在的负载，如果大于30，记录active的SQL
LOAD50=`/usr/bin/w|grep 'load average'|awk -F [':'] '{print $4}'|awk  -F [',']  '{print $1}' `
MIN=0.01
echo $LOAD50
if [ `echo "$LOAD50 > $MIN" | bc` -eq 1 ];
then
        echo "$LOAD50 is bigger"
        echo "========================== $RECORD_TIME        $LOAD50      ===================================" >> /home/wallog/load_monitor50.log
        /usr/bin/psql  -Upostgres -p5432  -h127.0.0.1  -d  postgres  -c "select * from pg_stat_activity ;" >> /home/wallog/load_monitor50.log
        echo "######################## end  ####################" >> /home/wallog/load_monitor50.log
fi