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init $PATH 
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linux ¶¨Ê±ÈÎÎñ crontab Ïêϸ½âÊÍ
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/sbin/service crond stop //¹Ø±Õ·þÎñ  
/sbin/service crond restart //ÖØÆô·þÎñ  
/sbin/service crond reload //ÖØÐÂÔØÈëÅäÖà  
//=========================================================================
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