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                            cron，是一個Linux定時執行工具，可以在無需人工干預的情況下運行作業。 
在Ubuntu server 下，cron是被默認安裝并啟動的；如果沒有啟動，自行設置并啟動(chkconfig\sysv-rc-conf)。 
http://blog.csdn.net/LOUISLIAOXH/article/details/48242289
### 設置定時任務

crontab -e
![](https://box.kancloud.cn/13aad2fae661c20a4c4e16b324814c4a_957x502.png)

重啟cron生效
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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