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crontabµÄÓ÷¨---linux¶¨Ê±ÈÎÎñ
Step 1:
    ʹÓÃÃüÁîcrontab
-e±à¼­Ò»¸ö¶¨Ê±Ö´ÐеÄÈÎÎñ»òÔÚ/var/spool/cron/crontabsĿ¼ÏÂн¨Ò»¸öÓë×Ô¼ºÓû§ÃûÏàͬµÄÈÎÎñ.
    ¼´:
   
#ÿ¸ôÒ»·ÖÖÓÖ´ÐÐÒ»´Îºǫ́³ÌÐòtmpmail
    * * * * * /home/milch/tmpmail
     ˳±ãÌáÒ»ÏÂcrontabÖеÄÃüÁî¸ñʽ:
     µÚÒ»¸ö * ±íʾ·ÖÖÓ (0-59),
     µÚ¶þ¸ö *
±íʾСʱ (0-23),
     µÚÈý¸ö * ±íʾÔ·ÝÖеÄijһÌì (1-31),
     µÚËĸö * ±íʾһÄêÖеÄijһÔÂ
(1-12),
     µÚÎå¸ö * ±íʾһÖÜÖеÄÐÇÆÚ¼¸ (0-6 with 0=Sunday).
Step 2:
     Í£Ö¹cron½ø³Ì,²¢ÖØÆô,
     ÃüÁî:/etc/init.d/cron stop
         
/etc/init.d/cron start
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crontab [ -u user ] file
crontab [ -u user ] { -l | -r | -e }
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crontab ÌṩÎÒÃÇÔڹ̶¨µÄ¼ä¸ôʱ¼äÖ´ÐÐ×Ô¶©µÄ³Ìʽ¡¢ÏµÍ³Ö¸Áî»ò shell
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·Ö -- 0-59
ʱ -- 0-23
ÈÕ -- 1-31
Ô -- 1-12 »òʹÓÃÓ¢ÎÄÃû³Æ
ÐÇÆÚ --
0-7 »òʹÓÃÓ¢ÎÄÃû³Æ
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crontab µÄ»ù±¾¸ñʽ¡£
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-u user
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-l
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-r
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-e
½øÈë vi ±à¼­ crontab µµ(ÈçÓÐÉ趨 VISUAL »ò EDITOR
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/etc/cron.allow
/etc/cron.deny
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#include <sys/sem.h>
int semctl(int sem_id, int sem_num, int command, …);
int semget(key_t key, int num_sems, int sem_flags);
int semop(int sem_id, struct sembuf *sem_ops, size_t num_sem_ops);
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#mkdir -p code/{branches,tags,trunk}
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