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²é¿´/etc/crontabÎļþ
SHELL=/bin/bash
PATH=/sbin:/bin:/usr/sbin:/usr/bin
MAILTO=root
HOME=/
# run-parts
01 * * * * root run-parts /etc/cron.hourly
02 4 * * * root run-parts /etc/cron.daily
22 4 * * 0 root run-parts /etc/cron.weekly
42 4 1 * * root run-parts /etc/cron.monthly
ǰËÄÐÐÊÇÓйØÉèÖÃcronÈÎÎñÔËÐеĻ·¾³±äÁ¿. SHELL±äÁ¿µÄÖµÖ¸¶¨ÏµÍ³Ê¹ÓõÄSHELL»·¾³(¸Ã ÑùÀýΪbash shell)£¬PATH±äÁ¿¶¨ÒåÁËÖ´ÐÐÃüÁîµÄ·¾¶¡£CronµÄÊä³öÒÔµç×ÓÓʼþµÄÐÎʽ·¢¸øMSILTO±ä Á¿¶¨ÒåµÄÓû§Ãû. Èç¹ûMAILTO±äÁ¿¶¨ÒåΪ¿Õ×Ö·û´®(MAILTO=""), µç×ÓÓʼþ²»»á±»·¢ËÍ. Ö´ÐÐÃüÁî»ò½Å±¾Ê±HOME±äÁ¿¿ÉÓÃÀ´ÉèÖüÒĿ¼¡£
Îļþ/etc/crontabÖÐÿÐÐÈÎÎñµÄÃèÊö¸ñʽÈçÏÂ:
minute hour day month dayofweek command
minute - ´Ó0 µ½ 59µÄ ÕûÊý
hour - ´Ó0µ½23µÄ ÕûÊý
day - ´Ó1µ½31µÄ ÕûÊý (±ØÐëÊÇÖ¸¶¨Ô·ݵÄÓÐЧÈÕÆÚ)
month - ´Ó1µ½12µÄ ÕûÊý (»òÈçJan»òFeb¼òдµÄÔ·Ý)
dayofweek - ´Ó0µ½7µÄÕûÊý,0»ò7ÓÃÀ´ÃèÊöÖÜÈÕ (»ò ÓÃSun»òMon¼ò дÀ´±íʾ)
command - ÐèÒªÖ´ÐеÄÃüÁî(¿ÉÓÃas ls /proc >> /tmp/proc»ò Ö´ÐÐ×Ô¶¨Òå½Å±¾µÄÃüÁî)
root±íʾÒÔrootÓû§Éí·ÝÀ´ÔËÐÐ
run-parts±íʾºóÃæ¸ú×ŵÄÊÇÒ»¸öÎļþ¼Ð£¬ÒªÖ´ÐеÄÊǸÃÎļþ¼ÐϵÄËùÓнű¾
¶ÔÓÚÒÔÉϸ÷Óï¾ä,ÐÇ ºÅ(*)±í ʾËùÓпÉÓõÄÖµ. Àý Èç,*ÔÚ Ö¸´úmonthʱ±íʾÿÔÂÖ´ÐУ¨ÐèÒª·ûºÏÆäËûÏÞÖÆÌõ¼þ£©¸ÃÃüÁî¡£
ÕûÊý¼äµÄÁ¬×ÖºÅ(-)±í ʾÕûÊýÁÐ,Àý Èç1-4Òâ ˼ÊÇÕûÊý1,2,3,4.
Ö¸¶¨ÊýÖµÓɶººÅ·Ö¿ª¡£È磺3,4,6,8±í ʾÕâËĸöÖ¸¶¨ÕûÊý.
·ûºÅ“/”Ö¸¶¨²½½øÉèÖÃ.“/<interger>”±íʾ²½½øÖµ¡£Èç0-59/2¶¨ÒåÿÁ½·ÖÖÓÖ´ÐÐÒ»´Î¡£²½½øÖµÒ²¿ÉÓÃÐǺűíʾ¡£Èç*/3ÓÃÀ´ÔËÐÐÿÈý¸öÔ·ÝÔËÐÐÖ¸¶¨ÈÎÎñ.
ÒÔ“#”¿ªÍ·µÄΪעÊÍÐÐ,²»»á±»Ö´ÐС£
Èç¹ûÒ»¸öcronÈÎ ÎñÐèÒª¶¨ÆÚ¶ø²»Êǰ´Ð¡Ê±,Ìì,ÖÜ,ÔÂÀ´Ö´ÐÐ,ÔòÐèÒªÌí¼Ó/etc/cron.dĿ¼. Õâ¸öĿ¼ÏµÄËùÓÐÎļþºÍÎļþ/etc/crontabÓï·¨Ïàͬ. ²é¿´ÑùÀý
# record the memory usage of the system every monday
# at 3:30AM in the file /tmp/meminfo
30 3 * * mon cat /proc/meminfo >> /tmp/meminfo
# run custom scrīpt the first day of every month at 4:10AM
10 4 1 * * /root/scrīpts/backup.sh
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