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	Automating Tasks with cron services
		Cron wakes up every minute and examines all the stored configuration files, called crontabs, to check each them for commands that may be scheduled to be executed at the current time.
		Cron table files, or crontabs, are text files which direct the cron daemon's activity.
		The first five fields instruct the cron daemon as to when to execute the command, which is contained in the sixth field.
	www.uwsg.iu.edu /usail/automation/cron.html (1180 words)

	Cron and Crontab examples and usage
		Cron searches its spool area (/var/spool/cron/crontabs) for crontab files (which are named after accounts in /etc/passwd); crontabs found are loaded into memory.
		Cron then wakes up every minute, examining all stored crontabs, checking each command to see if it should be run in the current minute.
		The children copies of cron running these processes have their name coerced to uppercase, as will be seen in the syslog and ps output.
	www.pantz.org /os/linux/programs/cron.shtml (1071 words)

	cron(8): daemon to execute scheduled commands - Linux man page
		Cron searches /var/spool/cron for crontab files which are named after accounts in /etc/passwd; crontabs found are loaded into memory.
		Cron also searches for /etc/crontab and the files in the /etc/cron.d directory, which are in a different format (see crontab(5)).
		In this version of cron, without the -p option, /etc/crontab must not be writable by any user other than root, no crontab files may be links, or linked to by any other file, and no crontab files may be executable, or be writable by any user other than their owner.
	www.die.net /doc/linux/man/man8/cron.8.html (486 words)

	Crontab - Wikipedia, the free encyclopedia
		Users can have their own individual crontab files and often there is a systemwide crontab file (usually in /etc or a subdirectory of /etc) which is also used but can only be edited by the system administrator(s).
		There is also an operator which some extended versions of cron support, the slash ('/') operator, which can be used to skip a given number of values.
		Under the commonly used Vixie cron, you can also turn off email notification for all of a particular user's cronjobs by adding this line to their crontab:
	en.wikipedia.org /wiki/Cron (741 words)

	Cron: Scheduling Jobs on the IU WWW Servers
		The second file contains the directives to the 'cron' job scheduling system that will cause your script to be run at the desired time on the desired days.
		A shorthand name for this file is the 'crontab' (for cron table) file for your account.
		After cron runs commands according to the contents of your crontab file, it mails you the output from standard output and standard error for these commands, unless you redirect standard output or standard error.
	webmaster.indiana.edu /tool_guide_info/crontab.shtml (1231 words)

	Man Page: cron (Site not responding. Last check: 2007-10-21)
		Additionally, cron reads the files in /etc/cron.d: it treats the files in /etc/cron.d as in the same way as the /etc/crontab file (they follow the special format of that file, i.e.
		cron then wakes up every minute, examining all stored crontabs, check- ing each command to see if it should be run in the current minute.
		cron logs its action to the syslog facility 'cron', and logging may be controlled using the standard syslogd(8) facility.
	www.cgi101.com /class/ch16/envman.cgi?cron (561 words)

	GNU Cron Specification:
		At the present time the most common cron daemon in use and available is Vixie cron (by Paul Vixie) and although it would seem that this package has fit the needs of a cron daemon so far, we do not see things the same.
		Vixie cron is a source of many exploits -- this forces each distribution of a GNU system to maintain separate versions of, essentially, the same package to keep their distributions secure.
		The sixth field is the command that is too be executed should cron determine a match with the 5 previous fields (see section 3.1.2 Matching).
	www.gnu.org /software/gcron/specification.html (1190 words)

	Consolidate cron scheduling and administration \| drupal.org (Site not responding. Last check: 2007-10-21)
		As a nice detail the page could show the time of the last cron run and perhaps provide a warning if it was a long time ago (more than a day, for example), which would serve as a clue to users that they might need to do something to set up crontabs.
		The search module bases its decision on whether to run cron on the presence of new content, so search would implement hook_cron_schedule to override this default form on the admin screen (either offering an alternative form to make a schedule or indicating that no scheduling is needed because it is handled at the module level).
		While, in general, I think the reliance on cron should be elimiated, in my other post I suggest that modules should as far as possible do their own maintainance, there may be cases where cron is approriate.
	drupal.org /node/28797 (2058 words)

	Tips For Linux - Scheduling tasks using Cron - Part II
		In case you have no idea about cron then I suggest you read Article No. 16 to get the basics right.
		Cron is an extremely useful tool available in Linux.
		If a particular instant of time (when a task was to be executed) is lost because of changing the time for daylight saving then cron will simply skip that task and wait for the next occurrence of that particular time.
	www.codecoffee.com /tipsforlinux/articles/17.html (766 words)

	Hamilton C shell Utility: Cron
		But cron can also be run as a service, which means it can run even under a different ID than the person currently logged in or even when no one is logged in.
		Finally, as service, cron can be either interactive, meaning it and its children get access to the console, or non-interactive, meaning it and its children will run invisibly, with no display output and no means for input through the keyboard or mouse.
		The choice of running cron as either an interactive or non- interactive service is this: if you run it interactively, then there may be a security hole since windows will appear and your users may be able to interact with the applications cron invokes in ways you didn't intend.
	www.hamiltonlabs.com /UserGuide/Utilities/cron.htm (1503 words)

	A..14 Cron
		The Cron Admin Tool is where you manage Scoop's scheduled tasks, those tasks which are not done in response to a user action, such as dealing with RDF feeds or cleaning up the sessions table in the database.
		If the cron is not a box, the function's code is in the scoop/lib directory; you will need to search for the function name, and if you change it you will need to stop and start apache for the changes to take effect.
		The action selected will apply to all cron items with checked boxes in the list of cron items, unless it is ``Add Cron'', in which case it will create a new row with the contents of the text boxes in the last row of the table.
	scoop.kuro5hin.org /guide/A_14_Cron.html (749 words)

	Cron, Batch and At
		Cron does cd to the home directory of the user whose cron job is being run, so "." will always refer to that directory- unless the command script itself changes directories and then issues another command.
		Linux cron has the very nice feature of being able to set environment variables directly in the crontab file (see man 5 crontab on a Linux system).
		If your script required Korn shell features, it would also fail (if cron notices that you are not running /bin/sh when you change a crontab, it will remind you that it plans to use /bin/sh).
	aplawrence.com /Unixart/cron.html (1358 words)

	[No title] (Site not responding. Last check: 2007-10-21)
		Briefly, this cron is better than the older BSD/V7 cron since it permits each user on the system to have their own private crontab.
		It does not contain "atrun" as does System V cron, and since those systems do not have a separate "atrun" that this cron can run, it is unlikely that any System V system will want to run this cron.
		Actually, this cron predates POSIX 1003.1's specification by a several years, but since the interface for this cron and POSIX's cron are both based on AT&T System V's cron, the differences were small and this latest version has been changed to the POSIX interface where they differed.
	www.isc.org /sources/utils/admin/cron_at/vixie-cron3.txt (316 words)

	Gentoo Linux Documentation -- Gentoo Linux Cron Guide
		Cron is a daemon that runs scheduled tasks based on input from the command crontab.
		Anacron is not a cron daemon, it is something that usually works in conjunction with one.
		No matter which cron package you use, if you want to allow a user to use crontab, he will first have to be in the cron group.
	www.gentoo.org /doc/en/cron-guide.xml (1926 words)

	Robbins Installation 6: vixie-cron
		cron reads configuration files (called crontabs) which contain lists of command lines, the times they are scheduled to be invoked and (BSD only) the login names under which they are to be run.
		cron scans through the crontabs at a regular period (could be every five minutes, etc.) and looks to see if there is a job to be released.
		I did a man on cron to see if I had the new version, and vixie-cron was indeed in the header of the page.
	ils.unc.edu /~robbe/inls283/install6.html (1046 words)

	Newbie: Intro to cron
		Newbie: Intro to cron Date: 30-Dec-99 Author: cogNiTioN Cron This file is an introduction to cron, it covers the basics of what cron does, and how to use it.
		Cron is the name of program that enables unix users to execute commands or scripts (groups of commands) automatically at a specified time/date.
		An entry in cron is made up of a series of fields, much like the /etc/passwd file is, but in the crontab they are separated by a space.
	www.unixgeeks.org /security/newbie/unix/cron-1.html (1651 words)

	Automating common tasks with cron
		Cron also allows users to create their own personal crontabs.
		When cron first starts up, it looks in /var/spool/cron and /etc/cron.d/ for crontabs and loads them into memory along with the system-level crontab.
		Cron then checks its schedule on a minute-by-minute basis for tasks to be executed.
	builder.com.com /5100-6372_14-5285858.html (660 words)

	The cron daemon is where all tim (Site not responding. Last check: 2007-10-21)
		Cron is a program that wakes up once a minute and checks it's configuration files to see if it needs to do anything.
		Cron is typically used to run system maintenance programs, and can be abused by users.
		If cron.deny exists then you will be allowed to use cron unless you are listed, this would be useful for "locking out" users that had previously abused cron or otherwise not allowed to use cron.
	www.softpanorama.org /Tools/Cron/cron_minitutorial.shtml (3455 words)

	./_Man_Solaris_2.6_html/html1m/cron.1m.html
		cron only examines crontab or at command files during its own process initialization phase and when the crontab or at command is run.
		cron captures the output of the job's stdout and stderr streams, and, if it is non-empty, mails the output to the user.
		If the job does not produce output, no mail is sent to the user (unless the job is an at.1 job and the -m option was specified when the job was submitted).
	www.cs.rit.edu /~hpb/Man/_Man_Solaris_2.6_html/html1m/cron.1m.html (356 words)

	ITworld.com - Using cron basics
		If cron does not appear to be running on your system, check with your system administrator, because a system without cron is unusual.
		You don't need to concern yourself with the mechanics of the cron daemon other than to know that it exists and that it is constantly polling the cron table files.
		Cron is usually used to run a script, but it can run any command.
	www.itworld.com /Comp/2378/swol-0825-unix101 (1425 words)

	cron: Job Scheduler \| Linux Journal
		I will use ``cron'' to refer, variously, to both the crond process and the cron facility.
		The reason is cron requires a specific format for its job entries.
		The fields in a time-specific cron command appear in this order: minute (0-59 allowed), hour (0-23 allowed), day of month (1-31 allowed), month (1-12 or names allowed), day of week (0-7 or names allowed, with both 0 and 7 representing Sunday), and the command to run.
	www2.linuxjournal.com /article/3290 (1141 words)

	Configuration, Logging and CRON (Site not responding. Last check: 2007-10-21)
		Cron runs commands in the /etc/crontab file, the /etc/cron.d directory, and /var/spool/cron directory that has file names of authorized users in the /etc/passwd file.
		Users may be able to schedule cron jobs if the system is configured to allow it.
		Use the crontab(1) command to submit the command(s) to cron by typing "crontab mycron".
	www.comptechdoc.org /os/linux/usersguide/linux_ugsysconfig.html (1580 words)

	Cron Manager Information (Site not responding. Last check: 2007-10-21)
		Cron Manager will even create an alias of the Cron Events Folder in the Apple Menu, giving you quick and easy access to all of your Cron entries.
		Cron Manager can be deactivated by flipping the on/off switch, and, by selecting the desired keys, you can customize the key combination needed to abort Cron Manager from installing itself at system startup.
		Cron Manager is also available bundled with CLImate, our command line interface and scripting system for the Macintosh, for $59.95 plus $3 shipping (overseas shipping is $6).
	ourworld.compuserve.com /homepages/orchardsw/CronManager.html (558 words)

	cron(8) - daemon to execute scheduled commands
		cron will then examine the modification time on all crontabs and reload those which have changed.
		cron need not be restarted whenever a crontab file is modified.
		The first case is for the jobs that run every at hour of a time interval overlapping with the disappearing or duplicated interval.
	www.gsp.com /cgi-bin/man.cgi?section=8&topic=cron (466 words)

	CRON - Calorie Restriction with Optimal Nutrition
		CRON does not have to be difficult or unpleasant, or as detractors like to say: 'a longer life, not worth living'.
		CRON does not have to be a lot of trouble.
		Most CRON foods are readily available in your local supermarket, and many of them require little or no preparation.
	www.optimal.org /peter/cron.htm (1278 words)

	freeware
		pycron is the successor to cron with a couple of changes and extensions.
		Cron for Windows 9x/NT/2000 is a flexible program to schedule execution of DOS commands and Windows-programs (e.g.
		Cron is also available as a NT service.
	www.kalab.com /freeware (243 words)

	Crontab Man Page
		Each user has their own crontab, and commands in any given crontab will be executed as the user who owns the crontab.
		Note that comments are not allowed on the same line as cron commands, since they will be taken to be part of the command.
		The format of a cron command is very much the V7 standard, with a number of upward-compatible extensions.
	www.littletechshoppe.com /servers/extensions/cron/crontab_5.html (904 words)

	Pass include and exclude parameters to cron.php for fine grained cron timing \| drupal.org (Site not responding. Last check: 2007-10-21)
		The admin would then set one cron tab to run at the smallest needed interval and could then decide on a module-by-module basis how often each is to run.
		If it is hardcoded how often the cron should run, administrators loose all control and you can't have different sites have different schedules, unless of course you have cron configuration in the interface itself.
		I think cron scheduling should be completely done with the cron tool itself, and that the URL or command that is given should be able to handle the fine tuning of which module's hooks get called.
	drupal.org /node/19173 (1481 words)

	Running PHP Scripts with Cron - Tutorials - HTMLCenter
		Cron is normally available on all Unix and Linux distributions; if you cannot access it, contact your root or server administrator.
		It is a daemon which allows you to schedule a program or script for a specific time of execution.
		If you want to learn more about cron, click here or type "man crontab" at your command prompt.
	www.htmlcenter.com /tutorials/tutorials.cfm/155/PHP (701 words)

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