Crontab - Revision history

Admin at 21:46, 20 August 2018

2018-08-20T21:46:38Z

← Older revision		Revision as of 21:46, 20 August 2018
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	<code>45 * * * * curl -s http://example.com/cron.php</code>		<code>45 * * * * curl -s http://example.com/cron.php</code>

			<code>45 * * * * /usr/bin/php -q /home/$user/public_html/script.php >/dev/null 2>&1</code>

	== References ==		== References ==

Admin: /* Fields */

2018-08-14T21:38:06Z

Fields

← Older revision		Revision as of 21:38, 14 August 2018
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	# * * * * * user-name command to be executed		# * * * * * user-name command to be executed
	</pre>		</pre>


			Note: <br/>
			These files are stored at /var/spool/cron or /var/spool/cron/crontabs

	== Examples ==		== Examples ==

Admin at 04:42, 11 January 2018

2018-01-11T04:42:22Z

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	Check cron jobs for all users (the following must be ran as root): <br />		Check cron jobs for all users (the following must be ran as root): <br />
	<code>for user in $(cut -f1 -d: /etc/passwd); do echo $user; crontab -u $user -l; done</code>		<code>for user in $(cut -f1 -d: /etc/passwd); do echo $user; crontab -u $user -l; done</code>


			== Run a php page as a cron job ==

			Add ONE of the following lines:

			<code>45 * * * * /usr/bin/lynx -source http://example.com/cron.php</code>

			<code>45 * * * * /usr/bin/wget -O - -q -t 1 http://www.example.com/cron.php</code>

			<code>45 * * * * curl -s http://example.com/cron.php</code>

Admin: /* References */

2017-02-16T18:58:39Z

References

← Older revision		Revision as of 18:58, 16 February 2017
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	<li>[https://www.cyberciti.biz/faq/how-do-i-add-jobs-to-cron-under-linux-or-unix-oses/ How to add Cron jobs]</li>		<li>[https://www.cyberciti.biz/faq/how-do-i-add-jobs-to-cron-under-linux-or-unix-oses/ How to add Cron jobs]</li>
	<li>[http://www.thegeekstuff.com/2009/06/15-practical-crontab-examples/ Geek Stuff 15 crontab examples]</li>		<li>[http://www.thegeekstuff.com/2009/06/15-practical-crontab-examples/ Geek Stuff 15 crontab examples]</li>
			<li>[http://www.htmlbasix.com/crontab.shtml Cron Job Creator]</li>
	</ol>		</ol>

Admin: /* Fields */

2017-02-16T18:57:39Z

Fields

← Older revision		Revision as of 18:57, 16 February 2017
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	<pre>		<pre>
	* * * * * command to be executed		# .---------------- minute (0 - 59)
	- - - - -		# \| .------------- hour (0 - 23)
	~~\| \| \| \| \|~~		# \| \| .---------- day of month (1 - 31)
	~~\| \| \| \|~~ ----- ~~Day of week~~ (0 - ~~7) (Sunday=0 or 7~~)		# \| \| \| .------- month (1 - 12) OR jan,feb,mar,apr ...
	\| ~~\| \|~~ ------- ~~Month~~ (1 - 12)		# \| \| \| \| .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat
	\| \| --------- ~~Day~~ of month (1 - 31)		# \| \| \| \| \|
	\| -------~~---- Hour~~ (0 - 23)		# * * * * * user-name command to be executed
	-----~~-------- Minute~~ (0 - ~~59)~~
	</pre>		</pre>


	== Examples ==		== Examples ==

Admin at 23:04, 20 January 2017

2017-01-20T23:04:24Z

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	@hourly           Run once an hour, "0 * * * *". <br />		@hourly           Run once an hour, "0 * * * *". <br />


			== Check what cron jobs are setup ==

			<code>crontab -l</code> - list the cron jobs for the current user

			<code>crontab -e</code> - edit the cron jobs for the current user

			Check cron jobs for all users (the following must be ran as root): <br />
			<code>for user in $(cut -f1 -d: /etc/passwd); do echo $user; crontab -u $user -l; done</code>

Admin at 18:36, 19 January 2017

2017-01-19T18:36:57Z

← Older revision		Revision as of 18:36, 19 January 2017
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	<li>[https://help.ubuntu.com/community/CronHowto Cron How To]</li>		<li>[https://help.ubuntu.com/community/CronHowto Cron How To]</li>
	<li>[https://www.cyberciti.biz/faq/how-do-i-add-jobs-to-cron-under-linux-or-unix-oses/ How to add Cron jobs]</li>		<li>[https://www.cyberciti.biz/faq/how-do-i-add-jobs-to-cron-under-linux-or-unix-oses/ How to add Cron jobs]</li>
			<li>[http://www.thegeekstuff.com/2009/06/15-practical-crontab-examples/ Geek Stuff 15 crontab examples]</li>
	</ol>		</ol>

Admin: /* References */

2017-01-14T20:23:07Z

References

← Older revision		Revision as of 20:23, 14 January 2017
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	<ol>		<ol>
	<li></li>		<li>[http://man.he.net/?topic=crontab&section=all Crontab Man Page]</li>
	<li>[https://help.ubuntu.com/community/CronHowto Cron How To]</li>		<li>[https://help.ubuntu.com/community/CronHowto Cron How To]</li>
	<li>[https://www.cyberciti.biz/faq/how-do-i-add-jobs-to-cron-under-linux-or-unix-oses/ How to add Cron jobs]</li>		<li>[https://www.cyberciti.biz/faq/how-do-i-add-jobs-to-cron-under-linux-or-unix-oses/ How to add Cron jobs]</li>
	</ol>		</ol>

Admin at 20:19, 14 January 2017

2017-01-14T20:19:38Z

← Older revision		Revision as of 20:19, 14 January 2017
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	<li></li>		<li></li>
	<li>[https://help.ubuntu.com/community/CronHowto Cron How To]</li>		<li>[https://help.ubuntu.com/community/CronHowto Cron How To]</li>
	<li></li>		<li>[https://www.cyberciti.biz/faq/how-do-i-add-jobs-to-cron-under-linux-or-unix-oses/ How to add Cron jobs]</li>
	</ol>		</ol>

Admin at 20:18, 14 January 2017

2017-01-14T20:18:31Z

← Older revision		Revision as of 20:18, 14 January 2017
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	<code>crontab -e</code> Lets you edit cron jobs for the current user (You can use su to switch users to manage their cron jobs.)<br />		<code>crontab -e</code> Lets you edit cron jobs for the current user (You can use su to switch users to manage their cron jobs.)<br />
	~~<br />~~
			== Fields ==

	Each line has five time-and-date fields, followed by a command, followed by a newline character ('\n'). The fields are separated by spaces. The five time-and-date fields cannot contain spaces. The five time-and-date fields are as follows:<br />		Each line has five time-and-date fields, followed by a command, followed by a newline character ('\n'). The fields are separated by spaces. The five time-and-date fields cannot contain spaces. The five time-and-date fields are as follows:<br />
	<br />		<br />
	minute (0-59), hour (0-23, 0 = midnight), day (1-31), month (1-12), weekday (0-6, 0 = Sunday).		minute (0-59), hour (0-23, 0 = midnight), day (1-31), month (1-12), weekday (0-6, 0 = Sunday).
	<~~br /~~>
	<br />		<pre>
			* * * * * command to be executed
			- - - - -
			\| \| \| \| \|
			\| \| \| \| ----- Day of week (0 - 7) (Sunday=0 or 7)
			\| \| \| ------- Month (1 - 12)
			\| \| --------- Day of month (1 - 31)
			\| ----------- Hour (0 - 23)
			------------- Minute (0 - 59)
			</pre>


			== Examples ==
	<code>01 04 1 1 1 /usr/bin/somedirectory/somecommand</code>		<code>01 04 1 1 1 /usr/bin/somedirectory/somecommand</code>

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	<code>/10 * * * /usr/bin/somedirectory/somecommand</code>		<code>/10 * * * /usr/bin/somedirectory/somecommand</code>
	~~<br />~~
	~~<br />~~		== Special Strings ==

	Cron also offers some special strings, which can be used in place of the five time-and-date fields:		Cron also offers some special strings, which can be used in place of the five time-and-date fields:

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	@midnight           (same as @daily)<br />		@midnight           (same as @daily)<br />
	@hourly           Run once an hour, "0 * * * *". <br />		@hourly           Run once an hour, "0 * * * *". <br />