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linux ¶¨Ê±ÈÎÎñ crontab Ïêϸ½âÊÍ
cron ÊÇlinuxµÄÄÚÖ÷þÎñ£¬µ«Ëü²»×Ô¶¯ÆðÀ´£¬¿ÉÒÔÓÃÒÔϵķ½·¨Æô¶¯¡¢¹Ø±ÕÕâ¸ö·þÎñ£º  
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/sbin/service crond start //Æô¶¯·þÎñ  
/sbin/service crond stop //¹Ø±Õ·þÎñ  
/sbin/service crond restart //ÖØÆô·þÎñ  
/sbin/service crond reload //ÖØÐÂÔØÈëÅäÖà  
//=========================================================================
# Use the hash sign to prefix a comment
# +---------------- minute (0 - 59)
# |  +------------- hour (0 - 23)
# |  |  +---------- day of month (1 - 31)
# |  |  |  +------- month (1 - 12)
# |  |  |  |  +---- day of week (0 - 7) (Sunday=0 or 7)
# |  |  |  |  |
# *  *  *  *  *  command to be executed
//=============================================================================
ºÜ¶àʱºò£¬ÄãûÓа취ÖØÐÂÆô¶¯crond£¬Õâ¸öʱºò¿ÉÒÔÏÈkillall crond È»ºóÔÙcrond restart¾ÍŶokÁË¡£
ÄãÒ²¿ÉÒÔ½«Õâ¸ö·þÎñÔÚϵͳÆô¶¯µÄʱºòÒ²×Ô¶¯Æô¶¯£º  
ÒýÓÃ:  
ÔÚ/etc/rc.d/rc.localÕâ¸ö½Å±¾µÄĩβ¼ÓÉÏ£º  
/sbin/service crond start  
ÏÖÔÚcronÕâ¸ö·þÎñÒѾ­ÔÚ½ø³ÌÀïÃæÁË£¬ÎÒÃǾͿÉÒÔÓÃÕâ¸ö·þÎñÁË£¬cron·þÎñÌṩÒÔϼ¸ÖÖ½Ó¿Ú¹©´ó¼ÒʹÓ㺠 
1.Ö±½ÓÓÃcrontabÃüÁî±à¼­  
cron·þÎñÌṩcrontabÃüÁîÀ´É趨cron·þÎñµÄ£¬ÒÔÏÂÊÇÕâ¸öÃüÁîµÄһЩ²ÎÊýÓë˵Ã÷£º  
ÒýÓÃ:  
crontab -u //É趨ij¸öÓû§µÄcron·þÎñ£¬Ò»°ãrootÓû§ÔÚÖ´ÐÐÕâ¸öÃüÁîµÄʱºòÐèÒª´Ë²ÎÊý  
crontab -l //Áгöij¸öÓû§cron·þÎñµÄÏêϸÄÚÈÝ  
crontab -r //ɾ³ýû¸öÓû§µÄcron·þÎñ  
crontab -e //±à¼­Ä³¸öÓû§µÄcron·þÎñ  
±ÈÈç˵root²é¿´×Ô¼ºµÄcronÉèÖ㺠 
ÒýÓÃ:  
crontab -u root -l  
ÔÙÀýÈ磬rootÏëɾ³ýfredµÄcronÉèÖ㺠 
ÒýÓÃ:  
crontab -u fred -r  
Ôڱ༭cron·þÎñʱ£¬±à¼­µÄÄÚÈÝÓÐһЩ¸ñʽºÍÔ¼¶¨£¬ÊäÈ룺  
ÒýÓÃ:  
crontab -u root -e  
½øÈëvi±à¼­Ä£Ê½£¬±à¼­µÄÄÚÈÝÒ»¶¨Òª·ûºÏÏÂÃæµÄ¸ñʽ£º  
ÒýÓÃ:  
*/1 * * * * ls >> /tmp/ls.txt  
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