{"id":396,"date":"2022-06-11T17:07:11","date_gmt":"2022-06-11T09:07:11","guid":{"rendered":"https:\/\/www.qiangzhenshuai.com\/?p=396"},"modified":"2024-11-30T23:28:32","modified_gmt":"2024-11-30T15:28:32","slug":"linux-%e5%ae%9a%e6%97%b6%e4%bb%bb%e5%8a%a1","status":"publish","type":"post","link":"https:\/\/www.qiangzhenshuai.com\/?p=396","title":{"rendered":"Linux-\u5b9a\u65f6\u4efb\u52a1"},"content":{"rendered":"

1.\u8ba1\u5212\u4efb\u52a1\u57fa\u672c\u6982\u8ff0<\/h1>\r\n

crond<\/strong><\/h2>\r\n

\u4ec0\u4e48\u662fcrond\uff0ccrond\u5c31\u662f\u8ba1\u5212\u4efb\u52a1\uff0c\u7c7b\u4f3c\u4e8e\u6211\u4eec\u5e73\u65f6\u751f\u6d3b\u4e2d\u7684\u95f9\u949f\u3002\u5b9a\u70b9\u6267\u884c\u3002
\u8ba1\u5212\u4efb\u52a1\u4e3b\u8981\u662f\u505a\u4e00\u4e9b\u5468\u671f\u6027\u7684\u4efb\u52a1\uff0c\u6bd4\u5982: \u51cc\u66683\u70b9\u5b9a\u65f6\u5907\u4efd\u6570\u636e\u3002\u621611\u70b9\u5f00\u542f\u7f51\u7ad9\u62a2\u8d2d\u63a5\u53e3\uff0c12\u70b9\u5173\u95ed\u62a2\u5360\u63a5\u53e3\u3002\u8ba1\u5212\u4efb\u52a1\u4e3b\u8981\u5206\u4e3a\u4ee5\u4e0b\u4e24\u79cd\u4f7f\u7528\u60c5\u51b5:
1.\u7cfb\u7edf\u7ea7\u522b\u7684\u5b9a\u65f6\u4efb\u52a1\uff1a\u4e34\u65f6\u6587\u4ef6\u6e05\u7406\u3001\u7cfb\u7edf\u4fe1\u606f\u91c7\u96c6\u3001\u65e5\u5fd7\u6587\u4ef6\u5207\u5272
2.\u7528\u6237\u7ea7\u522b\u7684\u5b9a\u65f6\u4efb\u52a1\uff1a\u5b9a\u65f6\u5411\u4e92\u8054\u7f51\u540c\u6b65\u65f6\u95f4\u3001\u5b9a\u65f6\u5907\u4efd\u7cfb\u7edf\u914d\u7f6e\u6587\u4ef6\u3001\u5b9a\u65f6\u5907\u4efd\u6570\u636e\u5e93\u7684\u6570\u636e\u3001\u91cd\u590d\u6027\u7684\u5de5\u5177(\u83b7\u53d6\u7cfb\u7edf\u4fe1\u606f)<\/p>\r\n

<\/b>2.\u4f7f\u7528\u5b9a\u65f6\u4efb\u52a1(\u670d\u52a1)\u51c6\u5907<\/h1>\r\n

yum\u5b89\u88c5<\/strong><\/h2>\r\n
[root@dmxsp ~]# yum install -y cronie<\/pre>\r\n
\u542f\u52a8\u5e76\u5f00\u673a\u81ea\u542fcrond<\/strong><\/h2>\r\n
[root@dmxsp ~]# systemctl start crond.service
[root@dmxsp ~]# systemctl enable crond.service
[root@dmxsp ~]# systemctl status crond.service<\/pre>\r\n
3.\u8ba1\u5212\u4efb\u52a1\u65f6\u95f4\u7ba1\u7406<\/h1>\r\n
Crontab\u914d\u7f6e\u6587\u4ef6\u8bb0\u5f55\u4e86\u65f6\u95f4\u5468\u671f\u7684\u542b\u4e49 : \u6574\u4f53\u683c\u5f0f<\/strong><\/h2>\r\n
\"\"<\/p>\r\n
[root@dmxsp ~]# cat \/etc\/crontab
SHELL=\/bin\/bash\u00a0 \u00a0 \u00a0 \u00a0 \uff08\u6267\u884c\u547d\u4ee4\u7684\u89e3\u91ca\u5668\uff09
PATH=\/sbin:\/bin:\/usr\/sbin:\/usr\/bin\u00a0 \u00a0\uff08\u73af\u5883\u53d8\u91cf\uff09
MAILTO=root\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \uff08\u90ae\u4ef6\u53d1\u7ed9\u8c01\uff09

# For details see man 4 crontabs

# Example of job definition:
# .---------------- minute (0 - 59)\u00a0 \u00a0 \u00a0 \u00a0 \uff08\u5206\u949f 0-59\uff09
# | .------------- hour (0 - 23)\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\uff08\u5c0f\u65f6 0-23\uff09
# | | .---------- day of month (1 - 31)\u00a0 \u00a0 \uff08\u65e5\u671f 1-31\uff09
# | | | .------- month (1 - 12) OR jan,feb,mar,apr ...\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \uff08\u6708\u4efd 1-12\uff09
# | | | | .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat \uff08\u5468\u51e0 0-6\u00a0 \u00a00\u6216 7\u8868\u793a\u5468\u65e5\uff09
# | | | | |
# * * * * * user-name command to be executed<\/pre>\r\n
\u5b9a\u65f6\u4efb\u52a1\u683c\u5f0f\u4e2d\u7684\u7b26\u53f7<\/strong><\/h2>\r\n
*\uff1a\u8868\u793a\u4efb\u610f\u7684(\u5206\u3001\u65f6\u3001\u65e5\u3001\u6708\u3001\u5468)\u65f6\u95f4\u90fd\u6267\u884c
-\uff1a\u8868\u793a\u4e00\u4e2a\u65f6\u95f4\u8303\u56f4\u6bb5, \u59825-7\u70b9
, (\u9017\u53f7)\uff1a\u8868\u793a\u5206\u9694\u65f6\u6bb5, \u59826,0,4\u8868\u793a\u5468\u516d\u3001\u65e5\u3001\u56db
\/1\uff1a\u8868\u793a\u6bcf\u9694n\u5355\u4f4d\u65f6\u95f4, \u5982*\/10 \u6bcf10\u5206\u949f<\/pre>\r\n
4.\u4e86\u89e3crontab\u7684\u65f6\u95f4\u7f16\u5199\u89c4\u8303<\/h1>\r\n
00 \u00a0 02 * \u00a0 * \u00a0 \u00a0 * \u00a0ls\u00a0 \u00a0 \u00a0 \u00a0 #\u6bcf\u5929\u7684\u51cc\u66682\u70b9\u6267\u884cls
00 \u00a0 02 1 \u00a0 * \u00a0 \u00a0 * \u00a0ls\u00a0 \u00a0 \u00a0 \u00a0#\u6bcf\u4e2a\u6708\u76841\u53f7\u51cc\u66682\u70b9\u6267\u884cls
00 \u00a0 02 14 \u00a02 \u00a0 \u00a0 * \u00a0ls\u00a0 \u00a0 \u00a0 #\u6bcf\u5e74\u76842\u670814\u65e5\u7684\u51cc\u66682\u70b9\u6267\u884cls
00 \u00a0 02 * \u00a0 * \u00a0 \u00a0 7 \u00a0ls\u00a0 \u00a0 \u00a0 \u00a0#\u6bcf\u5468\u65e5\u7684\u51cc\u66682\u70b9\u6267\u884cls
00 \u00a0 02 * \u00a0 6 \u00a0 \u00a0 5 \u00a0ls\u00a0 \u00a0 \u00a0 \u00a0#\u6bcf\u5e74\u76846\u6708\u7684\u5468\u4e94\u7684\u51cc\u66682\u70b9\u6267\u884cls
00 \u00a0 02 14 * \u00a0 \u00a0 7 \u00a0ls\u00a0 \u00a0 \u00a0 \u00a0#\u6bcf\u4e2a\u6708\u768414\u53f7\u6216\u6bcf\u5468\u5468\u65e5\u7684\u51cc\u666802\u70b9\u6267\u884cls #\u4e0d\u63a8\u8350\u540c\u65f6\u4e66\u5199\u65e5\u671f\u548c\u5468\u51e0#
00 \u00a0 02 14 \u00a02 \u00a0 \u00a0 7 \u00a0ls\u00a0 \u00a0 \u00a0 #\u6bcf\u5e74\u76842\u670814\u65e5\u6216\u5468\u65e5,\u51cc\u66682\u70b9\u6267\u884cls
*\/10 02 * \u00a0 * \u00a0 \u00a0 * \u00a0ls\u00a0 \u00a0 \u00a0 \u00a0#\u6bcf\u5929\u51cc\u66682\u70b9\u6bcf\u969410\u5206\u949f\u6267\u884c ls \u00a02:00 2:10 2:20 2:30 2:40 2:50
* \u00a0 * * \u00a0 * \u00a0 \u00a0 * \u00a0ls\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0#\u6bcf\u5206\u949f\u6267\u884c\u4e00\u6b21 ls
00 \u00a0 00 14 \u00a02 \u00a0 \u00a0 * \u00a0ls\u00a0 \u00a0 \u00a0 #\u6bcf\u5e74\u76842\u670814\u65e5\u7684\u534a\u591c12\u70b9\u6267\u884cls
*\/5 * * \u00a0 * \u00a0 \u00a0 * \u00a0ls\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0#\u6bcf\u4e94\u5206\u949f \u6267\u884cls
00 \u00a0 02 * \u00a0 1,5,8 * \u00a0ls\u00a0 \u00a0 \u00a0 #\u6bcf\u5e741,5,8\u6708\u7684\u6bcf\u5929\u51cc\u66682\u70b9\u6267\u884cls
00 \u00a0 02 1-8 * \u00a0 \u00a0 * \u00a0ls\u00a0 \u00a0 \u00a0 #\u6bcf\u6708\u76841-8\u53f7\u7684\u51cc\u66682\u70b9\u6267\u884cls
00 02 * * * ls\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0#\u6bcf\u5929\u7684\u51cc\u66682\u70b9\u6574\u6267\u884c
00 02 1 * * ls\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0#\u6bcf\u6708\u76841\u65e5\u7684\u51cc\u66682\u70b9\u6574\u6267\u884c
00 02 14 2 * ls\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 #\u6bcf\u5e74\u76842\u670814\u65e5\u51cc\u66682\u70b9\u6267\u884c
00 02 * * 7 ls\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 #\u6bcf\u5468\u5929\u7684\u51cc\u66682\u70b9\u6574\u6267\u884c
00 02 * 6 5 ls\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 #\u6bcf\u5e74\u76846\u6708\u5468\u4e94\u51cc\u66682\u70b9\u6267\u884c
00 02 14 * 7 ls\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 #\u6bcf\u670814\u65e5\u6216\u6bcf\u5468\u65e5\u7684\u51cc\u66682\u70b9\u90fd\u6267\u884c
00 02 14 2 7 ls\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0#\u6bcf\u5e74\u76842\u670814\u65e5\u6216\u6bcf\u5e742\u6708\u7684\u5468\u5929\u7684\u51cc\u66682\u70b9\u6267\u884c
*\/10 \u00a002 * * * ls\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 #\u6bcf\u5929\u51cc\u66682\u70b9\uff0c\u6bcf\u969410\u5206\u949f\u6267\u884c\u4e00\u6b21
* * * * * \u00a0ls\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 #\u6bcf\u5206\u949f\u90fd\u6267\u884c
00 00 14 2 * \u00a0ls\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 #\u6bcf\u5e742\u670814\u65e5\u7684\u51cc\u6668\u6267\u884c\u547d\u4ee4
*\/5 * * * * \u00a0ls\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 #\u6bcf\u96945\u5206\u949f\u6267\u884c\u4e00\u6b21
00 02 * 1,5,8 * ls\u00a0 \u00a0 \u00a0 \u00a0 \u00a0#\u6bcf\u5e74\u76841\u67085\u67088\u6708\u51cc\u66682\u70b9\u6267\u884c
00 02 1-8 * * \u00a0ls\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 #\u6bcf\u67081\u53f7\u52308\u53f7\u51cc\u66682\u70b9\u6267\u884c<\/pre>\r\n\r\n
\u4f7f\u7528crontab\u7f16\u5199cron\u5b9a\u65f6\u4efb\u52a1<\/strong><\/h2>\r\n\r\n\r\n\r\n
\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
\u53c2\u6570<\/strong><\/td>\r\n\u542b\u4e49<\/strong><\/td>\r\n<\/tr>\r\n
crontab -e edit<\/td>\r\n\u7f16\u8f91\u5b9a\u65f6\u4efb\u52a1 \u5f53\u524d\u662froot vi \/var\/spool\/cron\/root<\/td>\r\n<\/tr>\r\n
crontab -l list<\/td>\r\n\u67e5\u770b\u5f53\u524d\u7528\u6237\u7684\u5b9a\u65f6\u4efb\u52a1 \u5f53\u524d\u662froot cat \/var\/spool\/cron\/root<\/td>\r\n<\/tr>\r\n
crontab -r remove<\/td>\r\n\u6e05\u7a7a\/\u5220\u9664\u5f53\u524d\u7528\u6237\u7684\u6240\u6709\u5b9a\u65f6\u4efb\u52a1 rm -f \/var\/spool\/cron\/root<\/td>\r\n<\/tr>\r\n
crontab -u user<\/td>\r\n\u6307\u5b9a\u5176\u4ed6\u7528\u6237<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n\r\n\r\n\r\n
5.\u8ba1\u5212\u4efb\u52a1\u7f16\u5199\u5b9e\u8df5<\/h1>\r\n
\u4f7f\u7528root\u7528\u6237\u6bcf5\u5206\u949f\u6267\u884c\u4e00\u6b21\u65f6\u95f4\u540c\u6b65
<\/strong><\/h2>\r\n
[root@dmxsp ~]# yum install -y ntpdate
[root@dmxsp ~]# ntpdate time.windows.com
[root@dmxsp ~]# ntpdate ntp1.aliyun.com
[root@dmxsp ~]# crontab -e
no crontab for root - using an empty one
crontab: installing new crontab
[root@dmxsp ~]# crontab -l (\u9700\u8981\u7edd\u5bf9\u8def\u5f84)<\/strong>
*\/5 * * * * \/usr\/sbin\/ntpdate ntp1.aliyun.com &>\/dev\/null<\/pre>\r\n
\u68c0\u67e5\u4e0e\u6d4b\u8bd5<\/strong><\/h2>\r\n
date
<\/strong><\/h3>\r\n
-s\u00a0--set=STRING\uff1a\u6839\u636e\u5b57\u7b26\u4e32\u8bbe\u7f6e\u65f6\u95f4
-r\u00a0--reference=FILE\uff1a\u663e\u793a\u6587\u4ef6\u7684\u6700\u540e\u4fee\u6539\u65f6\u95f4
-d --date=STRING\uff1a\u663e\u793a\u7531\u5b57\u7b26\u4e32\u6307\u5b9a\u7684\u65f6\u95f4, \u800c\u4e0d\u662f\u5f53\u524d\u65f6\u95f4
-f\u00a0 --file=DATEFILE\uff1a\u7c7b\u4f3c\u4e8e--date; \u4e00\u6b21\u4eceDATEFILE\u5904\u7406\u4e00\u884c
-R\u00a0 --rfc-822\uff1a\u6839\u636e RFC-822 \u6307\u5b9a\u683c\u5f0f\u8f93\u51fa\u65e5\u671f
-u\u00a0 --utc, --universal\uff1a\u663e\u793a\u6216\u8bbe\u7f6e\u5168\u7403\u65f6\u95f4<\/pre>\r\n
FORMAT \u53c2\u6570<\/strong><\/h3>\r\n
%%<\/span>\uff1a\u8f93\u51fa\u5b57\u7b26<\/span>%<\/span> 
%<\/span>a\uff1a<\/span>\u661f\u671f\u51e0\u7684\u7f29\u5199<\/span> (<\/span>Sun<\/span>..<\/span>Sat<\/span>)<\/span> 
%<\/span>A\uff1a<\/span>\u661f\u671f\u7684\u5b8c\u6574\u540d\u79f0(<\/span>Sunday<\/span>..<\/span>Saturday<\/span>)\u3002<\/span> 
%<\/span>b\uff1a<\/span>\u7f29\u5199\u7684\u6708\u4efd\u540d\u79f0\uff08\u4f8b\u5982\uff0c<\/span>Jan<\/span>\uff09<\/span> 
%<\/span>B\uff1a<\/span>\u5b8c\u6574\u7684\u6708\u4efd\u540d\u79f0\uff08\u4f8b\u5982\uff0c<\/span>January<\/span>\uff09<\/span> 
%<\/span>c\uff1a<\/span>\u672c\u5730\u65e5\u671f\u548c\u65f6\u95f4\uff08\u4f8b\u5982\uff0c<\/span>Thu<\/span> Mar<\/span> 3<\/span> 23<\/span>:<\/span>05<\/span>:<\/span>25<\/span> 2005<\/span>\uff09<\/span> 
%<\/span>C\uff1a<\/span>\u4e16\u7eaa\uff0c\u548c%<\/span>Y<\/span>\u7c7b\u4f3c\uff0c\u4f46\u662f\u7701\u7565\u540e\u4e24\u4f4d\uff08\u4f8b\u5982\uff0c<\/span>20<\/span>\uff09<\/span> 
%<\/span>d\uff1a<\/span>\u65e5<\/span> (<\/span>01.<\/span>.<\/span>31<\/span>)<\/span> 
%<\/span>D\uff1a<\/span>\u65e5\u671f\uff0c\u7b49\u4ef7\u4e8e%<\/span>m<\/span>\/%<\/span>d<\/span>\/%<\/span>y 
<\/span>%<\/span>e\uff1a<\/span>\u4e00\u6708\u4e2d\u7684\u4e00\u5929\uff0c\u683c\u5f0f\u4f7f\u7528\u7a7a\u683c\u586b\u5145\uff0c\u7b49\u4ef7\u4e8e%<\/span>_d 
<\/span>%<\/span>F\uff1a<\/span>\u5b8c\u6574\u7684\u65e5\u671f\uff1b\u7b49\u4ef7\u4e8e<\/span> %<\/span>Y<\/span>-%<\/span>m<\/span>-%<\/span>d 
<\/span>%<\/span>g ISO\uff1a<\/span>\u6807\u51c6\u8ba1\u6570\u5468\u7684\u5e74\u4efd\u7684\u6700\u540e\u4e24\u4f4d\u6570\u5b57<\/span> 
%<\/span>G ISO\uff1a<\/span>\u6807\u51c6\u8ba1\u6570\u5468\u7684\u5e74\u4efd\uff0c\u901a\u5e38\u53ea\u5bf9%<\/span>V<\/span>\u6709\u7528<\/span> 
%<\/span>h\uff1a<\/span>\u7b49\u4ef7\u4e8e<\/span> %<\/span>b 
<\/span>%<\/span>H\uff1a<\/span>\u5c0f\u65f6<\/span> (<\/span>00.<\/span>.<\/span>23<\/span>)<\/span> 
%<\/span>I\uff1a<\/span>\u5c0f\u65f6<\/span> (<\/span>01.<\/span>.<\/span>12<\/span>)<\/span> 
%<\/span>j\uff1a<\/span>\u4e00\u5e74\u4e2d\u7684\u7b2c\u51e0\u5929<\/span> (<\/span>001.<\/span>.<\/span>366<\/span>)
<\/span>%<\/span>k\uff1a<\/span>\u5c0f\u65f6\uff0c\u4f7f\u7528\u7a7a\u683c\u586b\u5145<\/span> (<\/span> 0.<\/span>.<\/span>23<\/span>);<\/span> \u7b49\u4ef7\u4e8e<\/span> %<\/span>_H 
<\/span>%<\/span>l\uff1a<\/span>\u5c0f\u65f6,<\/span> \u4f7f\u7528\u7a7a\u683c\u586b\u5145<\/span> (<\/span> 1.<\/span>.<\/span>12<\/span>);<\/span> \u7b49\u4ef7\u4e8e<\/span> %<\/span>_I 
<\/span>%<\/span>m\uff1a<\/span>\u6708\u4efd<\/span> (<\/span>01.<\/span>.<\/span>12<\/span>)<\/span> 
%<\/span>M\uff1a<\/span>\u5206\u949f<\/span> (<\/span>00.<\/span>.<\/span>59<\/span>)<\/span> 
%<\/span>n\uff1a<\/span>\u65b0\u7684\u4e00\u884c\uff0c\u6362\u884c\u7b26<\/span> 
%<\/span>N\uff1a<\/span>\u7eb3\u79d2<\/span> (<\/span>000000000.<\/span>.<\/span>999999999<\/span>)<\/span> 
%<\/span>p\uff1a<\/span>\u7528\u4e8e\u8868\u793a\u5f53\u5730\u7684<\/span>AM<\/span>\u6216<\/span>PM<\/span>\uff0c\u5982\u679c\u672a\u77e5\u5219\u4e3a\u7a7a\u767d<\/span> 
%<\/span>P\uff1a<\/span>\u7c7b\u4f3c<\/span> %<\/span>p<\/span>,<\/span> \u4f46\u662f\u662f\u5c0f\u5199\u7684<\/span> 
%<\/span>r\uff1a<\/span>\u672c\u5730\u7684<\/span> 12<\/span> \u5c0f\u65f6\u5236\u65f6\u95f4(\u4f8b\u5982<\/span> 11<\/span>:<\/span>11<\/span>:<\/span>04<\/span> PM<\/span>)<\/span> 
%<\/span>R\uff1a<\/span>24<\/span> \u5c0f\u65f6\u5236<\/span> \u7684\u5c0f\u65f6\u4e0e\u5206\u949f;<\/span> \u7b49\u4ef7\u4e8e<\/span> %<\/span>H<\/span>:%<\/span>M 
<\/span>%<\/span>s\uff1a<\/span>\u81ea<\/span> 1970<\/span>-<\/span>01<\/span>-<\/span>01<\/span> 00<\/span>:<\/span>00<\/span>:<\/span>00<\/span> UTC <\/span>\u5230\u73b0\u5728\u7684\u79d2\u6570<\/span> 
%<\/span>S\uff1a<\/span>\u79d2<\/span> (<\/span>00.<\/span>.<\/span>60<\/span>)<\/span> 
%<\/span>t\uff1a<\/span>\u63d2\u5165\u6c34\u5e73\u5236\u8868\u7b26<\/span> tab 
<\/span>%<\/span>T\uff1a<\/span>\u65f6\u95f4;<\/span> \u7b49\u4ef7\u4e8e<\/span> %<\/span>H<\/span>:%<\/span>M<\/span>:%<\/span>S 
<\/span>%<\/span>u\uff1a<\/span>\u4e00\u5468\u4e2d\u7684\u4e00\u5929<\/span> (<\/span>1.<\/span>.<\/span>7<\/span>);<\/span> 1<\/span> \u8868\u793a\u661f\u671f\u4e00<\/span> 
%<\/span>U\uff1a<\/span>\u4e00\u5e74\u4e2d\u7684\u7b2c\u51e0\u5468\uff0c\u5468\u65e5\u4f5c\u4e3a\u4e00\u5468\u7684\u8d77\u59cb<\/span> (<\/span>00.<\/span>.<\/span>53<\/span>)<\/span> 
%<\/span>V\uff1aISO <\/span>\u6807\u51c6\u8ba1\u6570\u5468\uff0c\u8be5\u65b9\u6cd5\u5c06\u5468\u4e00\u4f5c\u4e3a\u4e00\u5468\u7684\u8d77\u59cb<\/span> (<\/span>01.<\/span>.<\/span>53<\/span>)<\/span> 
%<\/span>w\uff1a<\/span>\u4e00\u5468\u4e2d\u7684\u4e00\u5929\uff08<\/span>0.<\/span>.<\/span>6<\/span>\uff09\uff0c<\/span>0<\/span>\u4ee3\u8868\u661f\u671f\u5929<\/span> 
%<\/span>W\uff1a<\/span>\u4e00\u5e74\u4e2d\u7684\u7b2c\u51e0\u5468\uff0c\u5468\u4e00\u4f5c\u4e3a\u4e00\u5468\u7684\u8d77\u59cb\uff08<\/span>00.<\/span>.<\/span>53<\/span>\uff09<\/span> 
%<\/span>x\uff1a<\/span>\u672c\u5730\u7684\u65e5\u671f\u683c\u5f0f\uff08\u4f8b\u5982\uff0c<\/span>12<\/span>\/<\/span>31<\/span>\/<\/span>99<\/span>\uff09<\/span> 
%<\/span>X\uff1a<\/span>\u672c\u5730\u7684\u65e5\u671f\u683c\u5f0f\uff08\u4f8b\u5982\uff0c<\/span>23<\/span>:<\/span>13<\/span>:<\/span>48<\/span>\uff09
<\/span>%<\/span>y\uff1a<\/span>\u5e74\u4efd\u540e\u4e24\u4f4d\u6570\u5b57<\/span> (<\/span>00.<\/span>.<\/span>99<\/span>)<\/span> %<\/span>Y <\/span>\u5e74<\/span> 
%<\/span>z\uff1a<\/span>+<\/span>hhmm <\/span>\u683c\u5f0f\u7684\u6570\u503c\u5316\u65f6\u533a\u683c\u5f0f\uff08\u4f8b\u5982\uff0c-<\/span>0400<\/span>\uff09<\/span> 
%:<\/span>z\uff1a<\/span>+<\/span>hh<\/span>:<\/span>mm <\/span>\u683c\u5f0f\u7684\u6570\u503c\u5316\u65f6\u533a\u683c\u5f0f\uff08\u4f8b\u5982\uff0c-<\/span>04<\/span>:<\/span>00<\/span>\uff09<\/span> 
%::<\/span>z\uff1a<\/span>+<\/span>hh<\/span>:<\/span>mm<\/span>:<\/span>ss<\/span>\u683c\u5f0f\u7684\u6570\u503c\u5316\u65f6\u533a\u683c\u5f0f\uff08\u4f8b\u5982\uff0c-<\/span>04<\/span>:<\/span>00<\/span>:<\/span>00<\/span>\uff09<\/span> 
%:::<\/span>z\uff1a<\/span>\u6570\u503c\u5316\u65f6\u533a\u683c\u5f0f\uff0c\u76f8\u6bd4\u4e0a\u4e00\u4e2a\u683c\u5f0f\u589e\u52a0<\/span>':'<\/span>\u4ee5\u663e\u793a\u5fc5\u8981\u7684\u7cbe\u5ea6\uff08\u4f8b\u5982\uff0c-<\/span>04<\/span>\uff0c+<\/span>05<\/span>:<\/span>30<\/span>\uff09<\/span> 
%<\/span>Z\uff1a<\/span>\u65f6\u533a\u7f29\u5199<\/span> \uff08\u5982<\/span> EDT<\/span>\uff09<\/span><\/pre>\r\n
\u4fee\u6539\u65f6\u95f4
<\/strong><\/h3>\r\n
[root@dmxsp ~]# date 
Wed Jun 15 14:08:18 +08 2022
[root@dmxsp ~]# date -s \"15:05:06\"
Wed Jun 15 15:05:06 +08 2022
[root@dmxsp ~]# date
Wed Jun 15 15:05:08 +08 2022
<\/strong><\/pre>\r\n
\u770b\u65e5\u5fd7
<\/strong><\/h3>\r\n
[root@dmxsp ~]# tail -f \/var\/log\/cron
<\/strong><\/pre>\r\n
\u67e5\u770b\u5b9a\u65f6\u4efb\u52a1
<\/strong><\/h3>\r\n
[root@dmxsp ~]# crontab -l
*\/5 * * * * \/usr\/sbin\/ntpdate ntp1.aliyun.com &>\/dev\/null \uff08\u6bcf\u4e94\u5206\u949f\u6267\u884c\u4e00\u6b21\uff09
<\/strong><\/pre>\r\n
\u67e5\u770b\u65f6\u95f4<\/strong><\/h3>\r\n
[root@dmxsp ~]# date
Wed Jun 15 14:40:56 +08 2022<\/pre>\r\n
\u6848\u4f8b\uff1a\u6bcf\u5929\u51cc\u66683\u70b9\u505a\u4e00\u6b21\u5907\u4efd\uff1f \u6253\u5305\u5907\u4efd\/etc\/\u5230\/tmp\u4e0b
<\/strong><\/h2>\r\n
\u5c06\u5907\u4efd\u547d\u4ee4\u5199\u5165\u4e00\u4e2a\u811a\u672c\u4e2d
\u6bcf\u5929\u5907\u4efd\u6587\u4ef6\u540d\u8981\u6c42\u683c\u5f0f\uff1a\u65f6\u95f4_hostname_ip_etc.tar.gz
\u5728\u6267\u884c\u8ba1\u5212\u4efb\u52a1\u65f6\uff0c\u4e0d\u8981\u8f93\u51fa\u4efb\u52a1\u4fe1\u606f
\u5b58\u653e\u5907\u4efd\u5185\u5bb9\u7684\u76ee\u5f55\u8981\u6c42\u53ea\u4fdd\u7559\u4e09\u5929\u7684\u6570\u636e<\/p>\r\n
\u5728\u547d\u4ee4\u884c\u5148\u6267\u884c\u6253\u5305\u547d\u4ee4
<\/strong><\/h3>\r\n
[root@dmxsp ~]#\u00a0 tar zcf \/tmp\/$(date +%F)_$(hostname)_$(ip addr | awk ‘\/^[0-9]+: \/ {}; \/inet.*global\/ {print gensub(\/(.*)\\\/(.*)\/, “\\\\1”, “g”, $2)}’ )_etc.tar.gz \/etc
[root@dmxsp ~]# ll \/tmp\/
total 10124
-rw-r–r– 1 root root 10366103 Jun 15 18:18 2022-06-15_dmxsp_10.0.0.22_etc.tar.gz<\/p>\r\n
\u5c06\u547d\u4ee4\u5199\u5165\u81f3\u4e00\u4e2a\u6587\u4ef6\u4e2d
<\/strong><\/h3>\r\n
[root@dmxsp ~]# cat \/root\/dmxsp.sh 
tar zcf \/tmp\/$(date +%F)_$(hostname)_$(ip addr | awk ‘\/^[0-9]+: \/ {}; \/inet.*global\/ {print gensub(\/(.*)\\\/(.*)\/, “\\\\1”, “g”, $2)}’ )_etc.tar.gz \/etc
find \/tmp\/ -name ‘*.tar.gz’ -mtime +3 -exec rm -rf {} \\;
<\/strong><\/p>\r\n
\u914d\u7f6e\u5b9a\u65f6\u4efb\u52a1
<\/strong><\/h3>\r\n
[root@dmxsp ~]# crontab -l
00 00 * * * sh \/root\/dmxsp.sh &>\/dev\/null
<\/strong><\/pre>\r\n
\u6bcf\u5929\u7684\u4e0b\u53483,5\u70b9\uff0c\u6bcf\u9694\u534a\u5c0f\u65f6\u6267\u884c\u4e00\u6b21sync\u547d\u4ee4
<\/strong><\/h3>\r\n
[root@dmxsp ~]#crontab -l
*\/30 15,17 * * * \/usr\/bin\/sync &>\/dev\/null<\/pre>\r\n
crond<\/b>\u5982\u4f55\u62d2\u7edd\u67d0\u4e2a\u7528\u6237\u4f7f\u7528<\/b><\/h3>\r\n
[root@dmxsp ~]# echo \"lilei\" >> \/etc\/cron.deny
[root@dmxsp ~]# crontab -e
You (lilei) are not allowed to use this program
(crontab)
See crontab(1) for more information<\/pre>\r\n
6.crond\u6ce8\u610f\u7684\u4e8b\u9879<\/h1>\r\n
1.\u7ed9\u5b9a\u65f6\u4efb\u52a1\u6ce8\u91ca, \u8868\u793a\u8bf4\u660e \u5b9a\u65f6\u4efb\u52a1\u4e3b\u8981\u4f5c\u7528
2.\u5c06\u9700\u8981\u5b9a\u671f\u6267\u884c\u7684\u4efb\u52a1\u5199\u5165Shell\u811a\u672c\u4e2d\uff0c\u907f\u514d\u76f4\u63a5\u4f7f\u7528\u547d\u4ee4\u65e0\u6cd5\u6267\u884c\u7684\u60c5\u51b5tar date %\u5728\u5b9a\u65f6\u4efb\u52a1\u4e2d\u6709\u7279\u6b8a\u542b\u4e49
3.\u5b9a\u65f6\u4efb\u52a1\u7684\u7ed3\u5c3e\u4e00\u5b9a\u8981\u6709&>\/dev\/null\u6216\u8005\u5c06\u7ed3\u679c\u8ffd\u52a0\u91cd\u5b9a\u5411&>>\/tmp\/date.log\u6587\u4ef6 
4.\u6ce8\u610f\u6709\u4e9b\u547d\u4ee4\u662f\u65e0\u6cd5\u6210\u529f\u6267\u884c\u7684 echo “123” >>\/tmp\/test.log&>\/dev\/null
5.\u5982\u679c\u4e00\u5b9a\u8981\u662f\u7528\u547d\u4ee4\uff0c\u547d\u4ee4\u5fc5\u987b\u4f7f\u7528\u7edd\u5bf9\u8def\u5f84<\/p>\r\n
7.\u8ba1\u5212\u4efb\u52a1\u5982\u4f55\u8c03\u8bd5<\/h1>\r\n
1.crond\u8c03\u8bd5<\/h2>\r\n
\u589e\u52a0\u9891\u7387
1.\u8c03\u6574\u4efb\u52a1\u6bcf\u5206\u949f\u6267\u884c\u7684\u9891\u7387, \u4ee5\u4fbf\u505a\u540e\u7eed\u7684\u8c03\u8bd5
2.\u8c03\u6574\u7cfb\u7edf\u65f6\u95f4<\/p>\r\n
\u6267\u884c\u811a\u672c\u8f93\u51fa\u5230\u6587\u4ef6
1.\u5982\u679c\u4f7f\u7528cron\u8fd0\u884c\u811a\u672c\uff0c\u8bf7\u5c06\u811a\u672c\u6267\u884c\u7684\u7ed3\u679c\u5199\u5165\u6307\u5b9a\u65e5\u5fd7\u6587\u4ef6, \u89c2\u5bdf\u65e5\u5fd7\u5185\u5bb9\u662f\u5426\u6b63\u5e38
2.\u547d\u4ee4\u4f7f\u7528\u7edd\u5bf9\u8def\u5f84, \u9632\u6b62\u65e0\u6cd5\u627e\u5230\u547d\u4ee4\u5bfc\u81f4\u5b9a\u65f6\u4efb\u52a1\u6267\u884c\u4ea7\u751f\u6545\u969c
3.\u901a\u8fc7\u67e5\u770b\/var\/log\/cron\u65e5\u5fd7\uff0c\u4ee5\u4fbf\u68c0\u67e5\u6211\u4eec\u6267\u884c\u7684\u7ed3\u679c\uff0c\u65b9\u4fbf\u8fdb\u884c\u8c03\u8bd5<\/p>\r\n
2.crond\u7f16\u5199\u601d\u8def<\/h2>\r\n
\u624b\u52a8\u6267\u884c\u547d\u4ee4\uff0c\u7136\u540e\u4fdd\u7559\u6267\u884c\u6210\u529f\u7684\u7ed3\u679c
\u7f16\u5199\u811a\u672c
1.\u7edf\u4e00\u8def\u5f84:\u811a\u672c\u9700\u8981\u7edf\u4e00\u8def\u5f84\/scripts
2.\u590d\u5236:\u811a\u672c\u5185\u5bb9\u590d\u5236\u6267\u884c\u6210\u529f\u7684\u547d\u4ee4(\u51cf\u5c11\u6bcf\u4e2a\u73af\u8282\u51fa\u9519\u51e0\u7387)
3.\u7b80\u5355\u7c97\u66b4:\u811a\u672c\u5185\u5bb9\u5c3d\u53ef\u80fd\u7684\u4f18\u5316, \u4f7f\u7528\u4e00\u4e9b\u53d8\u91cf\u6216\u4f7f\u7528\u7b80\u5355\u7684\u5224\u65ad\u8bed\u53e5
4.\u5b9a\u5411\u5230\u7a7a:\u811a\u672c\u6267\u884c\u7684\u8f93\u51fa\u4fe1\u606f\u53ef\u4ee5\u91cd\u5b9a\u5411\u81f3\u5176\u4ed6\u4f4d\u7f6e\u4fdd\u7559\u6216\u5199\u5165\/dev\/null
\u6267\u884c\u811a\u672c
1.\u4f7f\u7528bash\u547d\u4ee4\u6267\u884c, \u9632\u6b62\u811a\u672c\u6ca1\u6709\u589e\u52a0\u6267\u884c\u6743\u9650(\/usr\/bin\/bash)
2.\u6267\u884c\u811a\u672c\u6210\u529f\u540e\uff0c\u590d\u5236\u8be5\u6267\u884c\u7684\u547d\u4ee4\uff0c\u4ee5\u4fbf\u5199\u5165cron
\u7f16\u5199\u8ba1\u5212\u4efb\u52a1
1.\u52a0\u6ce8\u91ca: \u52a0\u4e0a\u5fc5\u8981\u7684\u6ce8\u91ca\u4fe1\u606f, \u4eba\u3001\u65f6\u95f4\u3001\u4efb\u52a1
2.\u6539\u65f6\u95f4:\u8bbe\u5b9a\u8ba1\u5212\u4efb\u52a1\u6267\u884c\u7684\u5468\u671f
3.\u53bb\u7c98\u8d34: \u7c98\u8d34\u6267\u884c\u811a\u672c\u7684\u547d\u4ee4(\u4e0d\u8981\u624b\u6572)
\u8c03\u8bd5\u8ba1\u5212\u4efb\u52a1
1.\u589e\u52a0\u4efb\u52a1\u9891\u7387\u6d4b\u8bd5
2.\u68c0\u67e5\u73af\u5883\u53d8\u91cf\u95ee\u9898: \u4f7f\u7528\u547d\u4ee4\u7edd\u5bf9\u8def\u5f84
3.\u770b\u65e5\u5fd7:\u68c0\u67e5crond\u670d\u52a1\u65e5\u5fd7<\/p>\r\n
8.\u4e0d\u5b9a\u65f6\u53d1\u9001\u5230\u9489\u9489<\/h1>\r\n
\u83b7\u53d6\u9489\u9489\u673a\u5668\u4ebaWebhook<\/h4>\r\n
\"\"<\/a><\/p>\r\n
\u811a\u672c<\/h4>\r\n
[root@master ~]$ cat rw\/dsrw.sh 
#!\/bin\/bash<\/p>\r\n
#\u9489\u9489\u673a\u5668\u4eba\u7684Webhook\u5730\u5740
webhook=’https:\/\/oapi.dingtalk.com\/robot\/send?access_token=627f4b88875a6c9ebb39c7ce6b4f49cd87587e7e27647424ca067dc9d4bcad71′<\/p>\r\n
#\u968f\u673a\u6d88\u606f\u6570\u7ec4
messages=(
“1.\u65e9\u4e0a\u5403\u4ec0\u4e48” 
“2.\u665a\u4e0a\u5403\u4ec0\u4e48” 
“3.\u4e2d\u5348\u5403\u4ec0\u4e48” 
)<\/p>\r\n
#\u53d1\u9001\u9489\u9489\u6d88\u606f
send_message() {
local message=$1
curl -X POST -H ‘Content-Type: application\/json’ -d ‘{“msgtype”: “text”, “text”: {“content”: “‘”$message”‘”}}’ $webhook
}<\/p>\r\n
#\u8bb0\u5f55\u5f00\u59cb\u65f6\u95f4
echo “\u5f00\u59cb\u65f6\u95f4: $(date)” >> \/root\/rw\/dsrw.log<\/p>\r\n
#\u968f\u673a\u9009\u53d6\u7b2c\u4e00\u6761\u6d88\u606f
first_index=$((RANDOM % ${#messages[@]}))
first_message=”${messages[$first_index]}”<\/p>\r\n
#\u79fb\u9664\u7b2c\u4e00\u6761\u6d88\u606f\uff0c\u9632\u6b62\u91cd\u590d
unset messages[$first_index]
messages=(“${messages[@]}”) # \u91cd\u65b0\u7d22\u5f15\u6570\u7ec4<\/p>\r\n
#\u968f\u673a\u9009\u53d6\u7b2c\u4e8c\u6761\u6d88\u606f
second_index=$((RANDOM % ${#messages[@]}))
second_message=”${messages[$second_index]}”<\/p>\r\n
#\u53d1\u9001\u7b2c\u4e00\u6761\u6d88\u606f\u5230\u9489\u9489
send_message “$first_message”<\/p>\r\n
#\u7b49\u5f85\u4e00\u6bb5\u65f6\u95f4\u540e\u53d1\u9001\u7b2c\u4e8c\u6761\u6d88\u606f
sleep $((RANDOM % 360)) # \u968f\u673a\u7b49\u5f85\u65f6\u95f4\uff08\u79d2\uff09\uff0c\u8303\u56f4\u662f0\u52303599\u79d2<\/p>\r\n
#\u53d1\u9001\u7b2c\u4e8c\u6761\u6d88\u606f\u5230\u9489\u9489
send_message “$second_message”<\/p>\r\n
#\u8bb0\u5f55\u7ed3\u675f\u65f6\u95f4
echo “\u7ed3\u675f\u65f6\u95f4: $(date)” >> \/root\/rw\/dsrw.log<\/p>\r\n
\u89e3\u91ca<\/h4>\r\n
\r\n
\r\n
send_message() {\r\n  local message=$1\r\n  curl -X POST -H 'Content-Type: application\/json' -d '{\"msgtype\": \"text\", \"text\": {\"content\": \"'\"$message\"'\"}}' $webhook\r\n}<\/strong><\/pre>\r\n<\/div>\r\n<\/div>\r\n
send_message() { … }: \u5b9a\u4e49\u4e00\u4e2a\u540d\u4e3asend_message\u7684\u51fd\u6570\u3002<\/p>\r\n
local message=$1: \u5728\u51fd\u6570\u5185\u90e8\u58f0\u660e\u4e00\u4e2a\u5c40\u90e8\u53d8\u91cfmessage\uff0c\u5e76\u5c06\u5176\u8bbe\u7f6e\u4e3a\u51fd\u6570\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\uff08\u5373\u4f20\u9012\u7ed9\u51fd\u6570\u7684\u6d88\u606f\u5185\u5bb9\uff09\u3002<\/p>\r\n
curl -X POST -H ‘Content-Type: application\/json’ -d ‘{“msgtype”: “text”, “text”: {“content”: “‘”$message”‘”}}’ $webhook: \u4f7f\u7528curl\u547d\u4ee4\u53d1\u9001\u4e00\u4e2aPOST\u8bf7\u6c42\u5230\u9489\u9489\u673a\u5668\u4eba\u7684Webhook URL\u3002\u8bf7\u6c42\u5934\u8bbe\u7f6e\u4e3aContent-Type: application\/json\uff0c\u8bf7\u6c42\u4f53\u662f\u4e00\u4e2aJSON\u5bf9\u8c61\uff0c\u5305\u542b\u6d88\u606f\u7c7b\u578b\u548c\u5185\u5bb9\u3002<\/p>\r\n
\r\n
\r\n
echo \"\u5f00\u59cb\u65f6\u95f4: $(date)\" >> \/root\/rw\/dsrw.log<\/strong><\/pre>\r\n<\/div>\r\n<\/div>\r\n
echo “\u5f00\u59cb\u65f6\u95f4: $(date)” >> \/root\/rw\/dsrw.log: \u5c06\u5f53\u524d\u65f6\u95f4\uff08\u4f7f\u7528$(date)\u83b7\u53d6\uff09\u8bb0\u5f55\u5230\u65e5\u5fd7\u6587\u4ef6\/root\/rw\/dsrw.log\u4e2d\uff0c\u8868\u793a\u811a\u672c\u7684\u5f00\u59cb\u65f6\u95f4\u3002<\/p>\r\n
\r\n
\r\n
first_index=$((RANDOM % ${#messages[@]}))<\/strong><\/pre>\r\n<\/div>\r\n<\/div>\r\n
first_index=$((RANDOM % ${#messages[@]})): \u751f\u6210\u4e00\u4e2a\u968f\u673a\u7d22\u5f15first_index\uff0c\u8303\u56f4\u662f\u4ece0\u5230\u6570\u7ec4messages\u7684\u957f\u5ea6\u51cf1\u3002RANDOM\u662fBash\u5185\u7f6e\u7684\u968f\u673a\u6570\u751f\u6210\u5668\uff0c%\u8fd0\u7b97\u7b26\u7528\u4e8e\u53d6\u6a21\uff0c\u786e\u4fdd\u751f\u6210\u7684\u7d22\u5f15\u5728\u6709\u6548\u8303\u56f4\u5185\u3002<\/p>\r\n
\r\n
\r\n
first_message=\"${messages[$first_index]}\"<\/strong><\/pre>\r\n<\/div>\r\n<\/div>\r\n
first_message=”${messages[$first_index]}”: \u4ecemessages\u6570\u7ec4\u4e2d\u63d0\u53d6\u7d22\u5f15\u4e3afirst_index\u7684\u5143\u7d20\uff0c\u5e76\u5c06\u5176\u8d4b\u503c\u7ed9\u53d8\u91cffirst_message\u3002<\/p>\r\n
\r\n
\r\n
unset messages[$first_index]\r\nmessages=(\"${messages[@]}\")<\/strong><\/pre>\r\n<\/div>\r\n<\/div>\r\n
unset messages[$first_index]: \u4ecemessages\u6570\u7ec4\u4e2d\u79fb\u9664\u7d22\u5f15\u4e3afirst_index\u7684\u5143\u7d20\u3002<\/p>\r\n
messages=(“${messages[@]}”): \u91cd\u65b0\u7d22\u5f15\u6570\u7ec4\uff0c\u4ee5\u53bb\u9664\u7a7a\u6d1e\uff08\u5373\u79fb\u9664\u5143\u7d20\u540e\u7559\u4e0b\u7684\u7a7a\u4f4d\uff09\u3002<\/p>\r\n
\r\n
\r\n
second_index=$((RANDOM % ${#messages[@]}))<\/strong><\/pre>\r\n<\/div>\r\n<\/div>\r\n
second_index=$((RANDOM % ${#messages[@]})): \u751f\u6210\u53e6\u4e00\u4e2a\u968f\u673a\u7d22\u5f15second_index\uff0c\u8303\u56f4\u662f\u4ece0\u5230\u66f4\u65b0\u540e\u7684\u6570\u7ec4messages\u7684\u957f\u5ea6\u51cf1\u3002<\/p>\r\n
\r\n
\r\n
second_message=\"${messages[$second_index]}\"<\/strong><\/pre>\r\n<\/div>\r\n<\/div>\r\n
second_message=”${messages[$second_index]}”: \u4ece\u66f4\u65b0\u540e\u7684messages\u6570\u7ec4\u4e2d\u63d0\u53d6\u7d22\u5f15\u4e3asecond_index\u7684\u5143\u7d20\uff0c\u5e76\u5c06\u5176\u8d4b\u503c\u7ed9\u53d8\u91cfsecond_message\u3002<\/p>\r\n
\r\n
\r\n
send_message \"$first_message\"<\/strong><\/pre>\r\n<\/div>\r\n<\/div>\r\n
send_message “$first_message”: \u8c03\u7528send_message\u51fd\u6570\uff0c\u5c06first_message\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\uff0c\u53d1\u9001\u7b2c\u4e00\u6761\u6d88\u606f\u5230\u9489\u9489\u3002<\/p>\r\n
\r\n
\r\n
sleep $((RANDOM % 360)) # \u968f\u673a\u7b49\u5f85\u65f6\u95f4\uff08\u79d2\uff09\uff0c\u8303\u56f4\u662f0\u5230359\u79d2<\/strong><\/pre>\r\n<\/div>\r\n<\/div>\r\n
sleep $((RANDOM % 360)): \u4f7f\u811a\u672c\u6682\u505c\u4e00\u6bb5\u65f6\u95f4\uff0c\u7b49\u5f85\u65f6\u95f4\u4e3a0\u5230359\u79d2\u4e4b\u95f4\u7684\u968f\u673a\u79d2\u6570\u3002RANDOM % 360\u751f\u6210\u4e00\u4e2a0\u5230359\u4e4b\u95f4\u7684\u968f\u673a\u6570\u3002<\/p>\r\n
RANDOM\u662f\u4e00\u4e2a\u5185\u7f6e\u53d8\u91cf\uff0c\u5b83\u4f1a\u751f\u6210\u4e00\u4e2a\u4ecb\u4e8e 0 \u5230 32767 \u4e4b\u95f4\u7684\u968f\u673a\u6574\u6570<\/p>\r\n
\r\n
\r\n
send_message \"$second_message\"<\/strong><\/pre>\r\n<\/div>\r\n<\/div>\r\n
send_message “$second_message”: \u8c03\u7528send_message\u51fd\u6570\uff0c\u5c06second_message\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\uff0c\u53d1\u9001\u7b2c\u4e8c\u6761\u6d88\u606f\u5230\u9489\u9489\u3002<\/p>\r\n
\r\n
\r\n
echo \"\u7ed3\u675f\u65f6\u95f4: $(date)\" >> \/root\/rw\/dsrw.log<\/strong><\/pre>\r\n<\/div>\r\n<\/div>\r\n
echo “\u7ed3\u675f\u65f6\u95f4: $(date)” >> \/root\/rw\/dsrw.log: \u5c06\u5f53\u524d\u65f6\u95f4\uff08\u4f7f\u7528$(date)\u83b7\u53d6\uff09\u8bb0\u5f55\u5230\u65e5\u5fd7\u6587\u4ef6\/root\/rw\/dsrw.log\u4e2d\uff0c\u8868\u793a\u811a\u672c\u7684\u7ed3\u675f\u65f6\u95f4\u3002<\/p>\r\n
first_index=$((RANDOM % ${#messages[@]}))<\/strong>
first_message=\"${messages[$first_index]}\"<\/strong><\/pre>\r\n
first_index=$((RANDOM % ${#messages[@]}))<\/p>\r\n
RANDOM: \u8fd9\u662fBash\u5185\u7f6e\u7684\u4e00\u4e2a\u7279\u6b8a\u53d8\u91cf\uff0c\u6bcf\u6b21\u5f15\u7528\u65f6\u90fd\u4f1a\u751f\u6210\u4e00\u4e2a0\u523032767\u4e4b\u95f4\u7684\u4f2a\u968f\u673a\u6574\u6570\u3002<\/p>\r\n
${#messages[@]}: \u8fd9\u662f\u4e00\u4e2a\u6570\u7ec4\u957f\u5ea6\u8868\u8fbe\u5f0f\uff0c\u7528\u4e8e\u83b7\u53d6\u6570\u7ec4messages\u7684\u5143\u7d20\u6570\u91cf\u3002messages\u662f\u4e00\u4e2a\u5305\u542b\u591a\u6761\u6d88\u606f\u7684\u6570\u7ec4\u3002<\/p>\r\n
%\u8fd0\u7b97\u7b26: \u8fd9\u662f\u53d6\u6a21\u8fd0\u7b97\u7b26\uff0c\u7528\u4e8e\u8ba1\u7b97\u9664\u6cd5\u540e\u7684\u4f59\u6570\u3002\u8fd9\u91cc\u5b83\u7528\u6765\u786e\u4fdd\u751f\u6210\u7684\u968f\u673a\u6570\u57280\u5230\u6570\u7ec4\u957f\u5ea6\u51cf1\u7684\u8303\u56f4\u5185\u3002<\/p>\r\n
$((…)): \u8fd9\u662f\u4e00\u4e2a\u7b97\u672f\u6269\u5c55\u8bed\u6cd5\uff0c\u7528\u4e8e\u6267\u884c\u7b97\u672f\u8fd0\u7b97\u3002\u5728\u8fd9\u91cc\uff0c\u5b83\u7528\u4e8e\u8ba1\u7b97RANDOM % ${#messages[@]}\u7684\u7ed3\u679c\uff0c\u5e76\u5c06\u7ed3\u679c\u8d4b\u503c\u7ed9first_index\u3002<\/p>\r\n
\u7efc\u5408\u8d77\u6765\uff0c\u8fd9\u884c\u4ee3\u7801\u7684\u4f5c\u7528\u662f\u4ece0\u5230\u6570\u7ec4messages\u7684\u957f\u5ea6\u51cf1\u4e4b\u95f4\u751f\u6210\u4e00\u4e2a\u968f\u673a\u7d22\u5f15\uff0c\u5e76\u5c06\u5176\u5b58\u50a8\u5728\u53d8\u91cffirst_index\u4e2d\u3002<\/p>\r\n
first_message=”${messages[$first_index]}”<\/p>\r\n
${messages[$first_index]}: \u8fd9\u662f\u4e00\u4e2a\u6570\u7ec4\u5143\u7d20\u8bbf\u95ee\u8868\u8fbe\u5f0f\uff0c\u7528\u4e8e\u4ece\u6570\u7ec4messages\u4e2d\u83b7\u53d6\u7d22\u5f15\u4e3afirst_index\u7684\u5143\u7d20\u3002first_index\u662f\u4e0a\u4e00\u884c\u4ee3\u7801\u751f\u6210\u7684\u968f\u673a\u7d22\u5f15\u3002<\/p>\r\n
first_message=…: \u5c06\u83b7\u53d6\u5230\u7684\u6d88\u606f\u5185\u5bb9\u8d4b\u503c\u7ed9\u53d8\u91cffirst_message\u3002<\/p>\r\n
\u7efc\u5408\u8d77\u6765\uff0c\u8fd9\u884c\u4ee3\u7801\u7684\u4f5c\u7528\u662f\u4ecemessages\u6570\u7ec4\u4e2d\u63d0\u53d6\u7d22\u5f15\u4e3afirst_index\u7684\u6d88\u606f\uff0c\u5e76\u5c06\u5176\u5b58\u50a8\u5728\u53d8\u91cffirst_message\u4e2d\u3002<\/p>\r\n
unset messages[$first_index]<\/strong>
messages=(\"${messages[@]}\")\u00a0<\/strong><\/pre>\r\n
unset messages[$first_index]<\/p>\r\n
unset: \u8fd9\u662f\u4e00\u4e2aBash\u5185\u7f6e\u547d\u4ee4\uff0c\u7528\u4e8e\u5220\u9664\u53d8\u91cf\u6216\u6570\u7ec4\u5143\u7d20\u3002<\/p>\r\n
messages[$first_index]: \u8fd9\u662f\u6307\u5411\u6570\u7ec4messages\u4e2d\u7d22\u5f15\u4e3afirst_index\u7684\u5143\u7d20\u3002first_index\u662f\u4e4b\u524d\u751f\u6210\u7684\u968f\u673a\u7d22\u5f15\u3002<\/p>\r\n
\u7efc\u5408\u8d77\u6765\uff0c\u8fd9\u884c\u4ee3\u7801\u7684\u4f5c\u7528\u662f\u4ece\u6570\u7ec4messages\u4e2d\u79fb\u9664\u7d22\u5f15\u4e3afirst_index\u7684\u5143\u7d20\u3002\u6267\u884c\u8fd9\u884c\u4ee3\u7801\u540e\uff0cmessages\u6570\u7ec4\u4e2d\u5c06\u4e0d\u518d\u5305\u542b\u88ab\u79fb\u9664\u7684\u5143\u7d20\uff0c\u4f46\u6570\u7ec4\u4e2d\u7684\u5176\u4ed6\u5143\u7d20\u4ecd\u7136\u4fdd\u6301\u539f\u6837\uff0c\u53ea\u662f\u5728\u88ab\u79fb\u9664\u5143\u7d20\u7684\u4f4d\u7f6e\u4e0a\u4f1a\u7559\u4e0b\u4e00\u4e2a\u7a7a\u6d1e\uff08\u5373\u8be5\u4f4d\u7f6e\u7684\u5143\u7d20\u88ab\u5220\u9664\u4e86\uff09\u3002<\/p>\r\n
messages=(“${messages[@]}”)<\/p>\r\n
${messages[@]}: \u8fd9\u662f\u4e00\u4e2a\u6570\u7ec4\u6269\u5c55\u8868\u8fbe\u5f0f\uff0c\u5b83\u4f1a\u5c55\u5f00\u4e3a\u6570\u7ec4messages\u7684\u6240\u6709\u5143\u7d20\u3002<\/p>\r\n
messages=…: \u5c06\u5c55\u5f00\u540e\u7684\u6570\u7ec4\u5143\u7d20\u91cd\u65b0\u8d4b\u503c\u7ed9messages\u6570\u7ec4\u3002<\/p>\r\n
\u7efc\u5408\u8d77\u6765\uff0c\u8fd9\u884c\u4ee3\u7801\u7684\u4f5c\u7528\u662f\u91cd\u65b0\u7d22\u5f15\u6570\u7ec4messages\uff0c\u4ee5\u53bb\u9664\u4e4b\u524d\u7684\u7a7a\u6d1e\u3002\u5177\u4f53\u6765\u8bf4\uff0c\u5b83\u521b\u5efa\u4e86\u4e00\u4e2a\u65b0\u7684\u6570\u7ec4\uff0c\u5e76\u5c06\u65e7\u6570\u7ec4\u7684\u6240\u6709\u5143\u7d20\u590d\u5236\u5230\u65b0\u6570\u7ec4\u4e2d\uff0c\u4ece\u800c\u6d88\u9664\u7a7a\u6d1e\uff0c\u4f7f\u6570\u7ec4\u8fde\u7eed<\/p>\r\n
\u6743\u9650<\/h4>\r\n
chmod +x rw\/dsrw.sh<\/p>\r\n
\u5b9a\u65f6\u4efb\u52a1<\/h4>\r\n
[root@master ~]$ crontab -l
0 18-19 * * * \/root\/rw\/rw.sh &>>\/root\/rw\/dsrw.log
0 19-20 * * * (sleep $((RANDOM % 360)); \/root\/rw\/dsrw.sh) &>>\/root\/rw\/dsrw.log<\/p>\r\n
\u7b2c\u4e00\u79cd\u6267\u884c\u65b9\u5f0f<\/h2>\r\n
0 18-19 * * * \/root\/rw\/rw.sh &>>\/root\/rw\/dsrw.log<\/p>\r\n
\u811a\u672c<\/h4>\r\n
[root@master ~]$ cat rw\/rw.sh 
#!\/bin\/bash
sleep $((RANDOM % 360))
sh \/root\/rw\/dsrw.sh<\/p>\r\n
\u6743\u9650<\/h4>\r\n
chmod +x rw\/rw.sh<\/p>\r\n
\u7b2c\u4e8c\u79cd\u6267\u884c\u65b9\u5f0f<\/h2>\r\n
0 19-20 * * * (sleep $((RANDOM % 360)); \/root\/rw\/dsrw.sh) &>>\/root\/rw\/dsrw.log<\/p>\r\n
\u8fd9\u91cc\u53ef\u80fd\u4f1a\u6267\u884c\u4e0d\u6210\u529f\u9700\u8981\u6dfb\u52a0\u4e00\u4e2a\u73af\u5883\u53d8\u91cf<\/p>\r\n
vim \/etc\/profile<\/p>\r\n
export PATH=\/usr\/local\/sbin:\/usr\/local\/bin:\/usr\/sbin:\/usr\/bin:\/sbin:\/bin<\/p>\r\n
source \/etc\/profile<\/p>\r\n
\u89e3\u91ca<\/h4>\r\n
export PATH=\/usr\/local\/sbin:\/usr\/local\/bin:\/usr\/sbin:\/usr\/bin:\/sbin:\/bin \u8fd9\u4e00\u884c\u547d\u4ee4\u7684\u4f5c\u7528\u662f\u8bbe\u7f6e\u73af\u5883\u53d8\u91cf PATH\uff0c\u5b83\u5b9a\u4e49\u4e86\u7cfb\u7edf\u5728\u6267\u884c\u547d\u4ee4\u65f6\u67e5\u627e\u53ef\u6267\u884c\u6587\u4ef6\u7684\u76ee\u5f55\u5217\u8868\u3002\u5177\u4f53\u6765\u8bf4\uff0c\u8fd9\u884c\u547d\u4ee4\u5c06 PATH \u73af\u5883\u53d8\u91cf\u8bbe\u7f6e\u4e3a\u4ee5\u4e0b\u76ee\u5f55\u7684\u7ec4\u5408\uff1a<\/p>\r\n
\/usr\/local\/sbin
\/usr\/local\/bin
\/usr\/sbin
\/usr\/bin
\/sbin
\/bin<\/p>\r\n
\u8be6\u7ec6\u89e3\u91ca<\/h4>\r\n
\/usr\/local\/sbin: \u8fd9\u4e2a\u76ee\u5f55\u901a\u5e38\u7528\u4e8e\u5b58\u653e\u7cfb\u7edf\u7ba1\u7406\u5458\u4f7f\u7528\u7684\u672c\u5730\u5b89\u88c5\u7684\u53ef\u6267\u884c\u6587\u4ef6\u3002
\/usr\/local\/bin: \u8fd9\u4e2a\u76ee\u5f55\u901a\u5e38\u7528\u4e8e\u5b58\u653e\u672c\u5730\u5b89\u88c5\u7684\u7528\u6237\u7ea7\u53ef\u6267\u884c\u6587\u4ef6\u3002
\/usr\/sbin: \u8fd9\u4e2a\u76ee\u5f55\u901a\u5e38\u7528\u4e8e\u5b58\u653e\u7cfb\u7edf\u7ba1\u7406\u5458\u4f7f\u7528\u7684\u7cfb\u7edf\u7ea7\u53ef\u6267\u884c\u6587\u4ef6\u3002
\/usr\/bin: \u8fd9\u4e2a\u76ee\u5f55\u901a\u5e38\u7528\u4e8e\u5b58\u653e\u7cfb\u7edf\u7ea7\u7684\u7528\u6237\u53ef\u6267\u884c\u6587\u4ef6\u3002
\/sbin: \u8fd9\u4e2a\u76ee\u5f55\u901a\u5e38\u7528\u4e8e\u5b58\u653e\u7cfb\u7edf\u542f\u52a8\u548c\u7ef4\u62a4\u6240\u5fc5\u9700\u7684\u7cfb\u7edf\u7ea7\u53ef\u6267\u884c\u6587\u4ef6\u3002
\/bin: \u8fd9\u4e2a\u76ee\u5f55\u901a\u5e38\u7528\u4e8e\u5b58\u653e\u6240\u6709\u7528\u6237\u90fd\u53ef\u4ee5\u4f7f\u7528\u7684\u6700\u57fa\u672c\u547d\u4ee4\u3002<\/p>\r\n
\u6267\u884c\u7ed3\u679c<\/h4>\r\n
\"\"<\/a> \"\"<\/a><\/p>\r\n
\u65e5\u5fd7<\/h4>\r\n
tail -f rw\/dsrw.log<\/p>\r\n
\u5f00\u59cb\u65f6\u95f4: Sat Nov 30 18:03:02 CST 2024
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 88 100 27 100 61 111 252 --:--:-- --:--:-- --:--:-- 253
{\"errcode\":0,\"errmsg\":\"ok\"} % Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 88 100 27 100 61 100 226 --:--:-- --:--:-- --:--:-- 226
{\"errcode\":0,\"errmsg\":\"ok\"}\u7ed3\u675f\u65f6\u95f4: Sat Nov 30 18:07:51 CST 2024

\u5f00\u59cb\u65f6\u95f4: Sat Nov 30 19:03:06 CST 2024
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 88 100 27 100 61 66 149 --:--:-- --:--:-- --:--:-- 149
{\"errcode\":0,\"errmsg\":\"ok\"} % Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 88 100 27 100 61 70 159 --:--:-- --:--:-- --:--:-- 159
{\"errcode\":0,\"errmsg\":\"ok\"}\u7ed3\u675f\u65f6\u95f4: Sat Nov 30 19:06:07 CST 2024<\/pre>\r\n
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