Linux Crontab Shell脚本实现秒级定时任务

#!/bin/bash  
  
step=1 #间隔的秒数，不能大于60  
  
for (( i = 0; i < 60; i=(i+step) )); do  
    $(php '/home/www/php/crontab/crontab.php')  
    sleep $step  
done  
  
exit 0

# m h  dom mon dow   command 
* * * * * /home/www/php/crontab/crontab.sh