crontab | 易学教程

CRONTAB syntax error

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问题 Herer is my CRONTAB file (Ubuntu 10.10): 57 1 * * 2-6 ET=`date --date 'yesterday'+%Y%m%d`;echo $ET Even The syntax color indicate that something is wrong. and there is this error: Subject: Cron <root> ET=`date --date 'yesterday' + (failed) Content-Type: text/plain; charset=ANSI_X3.4-1968 X-Cron-Env: <SHELL=/bin/sh> X-Cron-Env: <HOME=/root> X-Cron-Env: <PATH=/usr/bin:/bin> X-Cron-Env: <LOGNAME=root> /bin/sh: Syntax error: EOF in backquote substitution But I am not sure whats wrong. Thanks a

Executing python3 file with a cron job.

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I have a python3 script located in /home/valence/ that gets the weather forecast for the current day (max and min temperature values in Celsius) from Yahoo! weather API. The file looks exactly like this: #!/usr/bin/python3 from urllib import request import json url="https://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20weather.forecast%20where%20woeid%3D349859%20and%20u='c'&format=json&diagnostics=true&callback=" response=request.urlopen(url) str_response = response.readall().decode('utf-8') dic = json.loads(str_response) dic["query"]["results"]["channel"]["location"]["region"]="R.M.

CodeIgniter Cron Job on Shared Hosting?

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问题 I am trying to learn how to do my first cron job using CodeIgniter. In the past, it seemed the only way to do this with CI was to use the wget command instead of php . The CodeIgniter User Guide, however, says that now you can do this from the command line, for example by running: $ cd /path/to/project; $ php index.php controller method This works great using Terminal on my local setup. But when I use a similar command in the cron section of cPanel on my shared hosting, the task just returns

Crontab sets 18:00 to 09:00

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I just want to set a crontab using that I want to make a program run at every 15 minutes from 18:00 to 09:00 I have given this statement and waited but I don't think it is working */15 18-9 * * 1-6 Program_name Any suggestion would be greatly appreciated I don’t think ranges can wrap around like that. Specify the hour as 0-9,18-23 instead. 来源： https://stackoverflow.com/questions/2592185/crontab-sets-1800-to-0900

鸟哥私房菜基础篇：程序管理与 SELinux 初探习题

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猫宁！！！参考： http://cn.linux.vbird.org/linux_basic/0440processcontrol.php 1- 简单说明什么是程序 (program) 而什么是程序 (process)？程序 (program) 是系统上面可以被运行的文件，由於 Linux 的完整档名 (由 / 写起) 仅能有一个，所以 program 的档名具有单一性。当程序被运行后，就会启动成程序 (process)，一个 program 可以被不同的使用者或者相同的使用者重复的运行成为多个程序，且该程序所造成的程序还因为不同的使用者，而有不同的权限，且每个 process 几乎都是独立的。 2- 我今天想要查询 /etc/crontab 与 crontab 这个程序的用法与写法，请问我该如何线上查询？查询 crontab 命令可以使用 man crontab 或 info crontab ，至於查询 /etc/crontab ，则可以使用 man 5 crontab 罗！ 3- 我要如何查询 crond 这个 daemon 的 PID 与他的 PRI 值呢？ ps aux | grep crond 即可查到！ 4- 我要如何修改 crond 这个 PID 的优先运行序？先以 ps aux 找到 crond 的 PID 后，再以： renice -n number

Linux学习之路-Linux-at及cron命令【7】---20171215

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Linux学习之路-Linux-at及cron命令【7】---20171215 DannyExia00 0 人评论 986人阅读 2017-12-24 17:28:03 ntpdate 命令 [root@Centos6~]#ntpdate 172.18.0.1 -------->ntpdate 命令跟服务器同步时间 18 Dec 21:16:25 ntpdate[7932]: step time server 172.18.0.1 offset 412750.511124 sec [root@Centos6~]#date 2017年 12月 18日星期一 21:16:35 CST [root@Centos6~]#ll /usr/bin/at -rwsr-xr-x. 1 root root 54464 3月 22 2017 /usr/bin/at -------->具有SUID权限 cron 命令周期性任务计划:cron 相关的程序包: cronie: 主程序包，提供crond守护进程及相关辅助工具 Cronie包含在预定时间运行指定程序的标准UNIX守护进程crond和相关工具。它是原来的vixie-cron的一个分支，并具有像使用pam和SELinux一样的安全和配置增强功能 cronie-anacron：cronie的补充程序，用于监控cronie任务执行状况

how to set cron job from php script?

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问题 i am new to cron job . i studied some basics about cron job . i can able to call php using cron tab. By using following command in /etc/crontab 10 * * * * root /usr/bin/php /var/www/PATH TO SCRIPT/email.php In email.php i have following code #!/usr/bin/php <?php mail ("examplemail@mail.com", "Cron Successful Public HTML!","Hello World from mycron.php!"); ?> For every 10mins i am getting mail. But i need to know is there any way to call cron job from php ( invoke cron from php) i get some idea

Crontab not running ruby script

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The crontab -l below doesn't seem to run. The script run by hand runs fine. Here is the error i'm seeing Dec 3 20:12:01 dahlia /USR/SBIN/CRON[13912]: (gigawatt) CMD (/bin/sh -c "(export PATH=/usr/bin:/bin; /home/gigawatt/drbronnersbot/drbronnersbot.rb)") Dec 3 20:12:01 dahlia /USR/SBIN/CRON[13910]: (CRON) error (grandchild #13912 failed with exit status 1) And here is the crontab: * * * * * /bin/sh -c "(export PATH=/usr/bin:/bin; /home/gigawatt/drbronnersbot/drbronnersbot.rb)" Permissions are fully open, its executable, i put the env path at the beginning of the file, still no dice. Edit : I

Is there a tool that allows visualization of crontab entries? [closed]

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I have crontabs for many machines, and wanted to see what started when, and to ensure load on the database server would be fine. Is there a tool that either converts crontab entries to iCal, or a tool that directly does visualization? I don't have a great cron specific answer for this but in case its helpful there are alternative schedulers which give you more information about the running jobs from a central view, something like Cisco's Tidal Scheduler 来源： https://stackoverflow.com/questions/9183796/is-there-a-tool-that-allows-visualization-of-crontab-entries

replace crontab file with -e

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Anyone know a way to give a file into crontab -e ? I cannot use the regular form of crontab giving it a path but still need to replace the whole contents. Perhaps setting EDITOR to something? You can source cron jobs from a file into your crontab using crontab /path/to/cron/file/name To make it more explicit for readability's sake, use the arrow < for sourcing. crontab < /path/to/cron/file/name Sourcing the cron jobs this way can throw error errors in crontab file, can't install in case the crontab entry you have are syntactically invalid in terms of scheduling, so make sure the cron entries