crontab 秒级实现

cron.sh

#!/bin/bash  
  
step=2 #间隔的秒数，不能大于60  
  
for (( i = 0; i < 60; i=(i+step) )); do  
    /usr/bin/curl 'http:/xxx.com/api/hello'
    sleep $step  
done  
  
exit 0

# http://blog.csdn.net/fdipzone/article/details/22701113 #