Comments on: Cron Tutorial – Managing cron tab or cron job is Easy! http://www.webmasters-central.com/article-blog/tutorials/cron-tutorial-managing-cron-tab-or-cron-job-is-easy/ Blog Dedicated To Internet Marketing! Wed, 03 Mar 2010 06:09:27 -0500 http://wordpress.org/?v=abc hourly 1 By: Jue's Blog » Using Gmail to send / receive emails on a different account (super complicated version) http://www.webmasters-central.com/article-blog/tutorials/cron-tutorial-managing-cron-tab-or-cron-job-is-easy/comment-page-1/#comment-4287 Jue's Blog » Using Gmail to send / receive emails on a different account (super complicated version) Fri, 26 Feb 2010 04:45:47 +0000 http://www.webmasters-central.com/article-blog/?p=164#comment-4287 [...] email every 10 minutes (provided the script itself isn’t having trouble sending mail). This tutorial on cron and this more detailed documentation can explain what these steps all mean, and tell you how to [...] [...] email every 10 minutes (provided the script itself isn’t having trouble sending mail). This tutorial on cron and this more detailed documentation can explain what these steps all mean, and tell you how to [...]

]]> By: Dama http://www.webmasters-central.com/article-blog/tutorials/cron-tutorial-managing-cron-tab-or-cron-job-is-easy/comment-page-1/#comment-4286 Dama Mon, 22 Feb 2010 22:01:43 +0000 http://www.webmasters-central.com/article-blog/?p=164#comment-4286 Worked for me..Thanks a lot! Worked for me..Thanks a lot!

]]> By: adbox http://www.webmasters-central.com/article-blog/tutorials/cron-tutorial-managing-cron-tab-or-cron-job-is-easy/comment-page-1/#comment-4283 adbox Sat, 30 Jan 2010 21:18:34 +0000 http://www.webmasters-central.com/article-blog/?p=164#comment-4283 This might be a service you are interested in: http://www.cronwatch.com . This service lets you manage crons externally. very easy. This might be a service you are interested in: http://www.cronwatch.com . This service lets you manage crons externally. very easy.

]]> By: Kalin Mandaliev http://www.webmasters-central.com/article-blog/tutorials/cron-tutorial-managing-cron-tab-or-cron-job-is-easy/comment-page-1/#comment-4281 Kalin Mandaliev Sun, 24 Jan 2010 23:27:27 +0000 http://www.webmasters-central.com/article-blog/?p=164#comment-4281 Linux was bulit mainly with the C programming language. In the C programming language a program has three data streams which can be handled separately : The greater-than (>) in commands like these redirect the program’s output somewhere. In this case, something is being redirected into /dev/null, and something is being redirected into &1. 0 means STDIN (STandarD INput) which is usually the keyboard; 1 means STDOUT (STandarD OUTput) which is the monitor; 2 means STDERR (STandarD ERRor) which is usually also the monitor by default. A program e.g. X by default prints it’s output to STDOUT, to the monitor. In the “X >/dev/null 2>&1″ statement, the first part “X >/dev/null” redirects X’s output from STDOUT to the /dev/null file which is something like a “bottomless hole” in Linux. What goes there never comes back. But X’s STDERR isn’t redirected yet so X’s error messages will still be printed to the monitor. The last part of the statement “2>&1″ redirects the STDERR (2) to STDOUT (1) which is already redircted to /dev/null. So none of them prints to the monitor any more. (We have to add the “&” sign before the number 1 otherwise STDERR (2) would be redirected to a simple file called 1 in the same directory instead of STDOUT.) That's it ! Best Regards, Kalin Mandaliev Linux was bulit mainly with the C programming language.
In the C programming language a program has three data streams which can be handled separately :
The greater-than (>) in commands like these redirect the program’s output somewhere. In this case, something is being redirected into /dev/null, and something is being redirected into &1.
0 means STDIN (STandarD INput) which is usually the keyboard;
1 means STDOUT (STandarD OUTput) which is the monitor;
2 means STDERR (STandarD ERRor) which is usually also the monitor by default.
A program e.g. X by default prints it’s output to STDOUT, to the monitor.
In the “X >/dev/null 2>&1″ statement, the first part “X >/dev/null” redirects X’s output from STDOUT to the /dev/null file which is something like a “bottomless hole” in Linux. What goes there never comes back.
But X’s STDERR isn’t redirected yet so X’s error messages will still be printed to the monitor.
The last part of the statement “2>&1″ redirects the STDERR (2) to STDOUT (1) which is already redircted to /dev/null.
So none of them prints to the monitor any more.
(We have to add the “&” sign before the number 1 otherwise STDERR (2) would be redirected to a simple file called 1 in the same directory instead of STDOUT.)
That’s it !
Best Regards,
Kalin Mandaliev

]]> By: Petia http://www.webmasters-central.com/article-blog/tutorials/cron-tutorial-managing-cron-tab-or-cron-job-is-easy/comment-page-1/#comment-4279 Petia Sat, 23 Jan 2010 23:30:53 +0000 http://www.webmasters-central.com/article-blog/?p=164#comment-4279 Hey guys, could you tell me, what does it mean this 2>&1. This is the second part of >/dev/null 2>&1. Till >/dev/null is ok and i understand, but after this i really don't know....Thanks in advance ! Hey guys, could you tell me, what does it mean this 2>&1. This is the second part of >/dev/null 2>&1. Till >/dev/null is ok and i understand, but after this i really don’t know….Thanks in advance !

]]> By: Sridhar http://www.webmasters-central.com/article-blog/tutorials/cron-tutorial-managing-cron-tab-or-cron-job-is-easy/comment-page-1/#comment-4277 Sridhar Fri, 15 Jan 2010 15:47:41 +0000 http://www.webmasters-central.com/article-blog/?p=164#comment-4277 How to create a cron job that runs on the last day of every month (considering that there could be 28, 29, 30 or 31 days in a month)? Thanks, Sridhar How to create a cron job that runs on the last day of every month (considering that there could be 28, 29, 30 or 31 days in a month)?

Thanks,
Sridhar

]]> By: David http://www.webmasters-central.com/article-blog/tutorials/cron-tutorial-managing-cron-tab-or-cron-job-is-easy/comment-page-1/#comment-4276 David Thu, 14 Jan 2010 15:52:06 +0000 http://www.webmasters-central.com/article-blog/?p=164#comment-4276 Hello, I am developing an ASP.NET script and I need to set up some scheduling like sending email if the members has not uploaded some data and so on. Or to make changes in MY SQL at regular interval. Now I know that things like this can be done with CRON but I am not very sure how to make it happen with ASP.NET. Your article is highly helpful and I was just expecting if you could help me a little with ASP.Net Thank you, - David Hello,

I am developing an ASP.NET script and I need to set up some scheduling like sending email if the members has not uploaded some data and so on. Or to make changes in MY SQL at regular interval.

Now I know that things like this can be done with CRON but I am not very sure how to make it happen with ASP.NET. Your article is highly helpful and I was just expecting if you could help me a little with ASP.Net

Thank you, – David

]]> By: Webmasters-central.com http://www.webmasters-central.com/article-blog/tutorials/cron-tutorial-managing-cron-tab-or-cron-job-is-easy/comment-page-1/#comment-4273 Webmasters-central.com Fri, 08 Jan 2010 23:33:44 +0000 http://www.webmasters-central.com/article-blog/?p=164#comment-4273 @Farook: It could be your host settings. Ask your host to comment on this new file creation. Or check other cron jobs of yours to see any of them are set to create backups of a php file. @Farook:
It could be your host settings. Ask your host to comment on this new file creation. Or check other cron jobs of yours to see any of them are set to create backups of a php file.

]]> By: Farook http://www.webmasters-central.com/article-blog/tutorials/cron-tutorial-managing-cron-tab-or-cron-job-is-easy/comment-page-1/#comment-4272 Farook Fri, 08 Jan 2010 13:43:48 +0000 http://www.webmasters-central.com/article-blog/?p=164#comment-4272 My Cron Script is working fine. And i used >/dev/null 2>&1 to Stop sending Emails. But each time a file is created in the same name of PHP file with trailing numbers like phpfile.php.1, phpfle.php.2, phpfile.php.3.... Is there any script to stop that? My Cron Script is working fine. And i used >/dev/null 2>&1 to Stop sending Emails. But each time a file is created in the same name of PHP file with trailing numbers like phpfile.php.1, phpfle.php.2, phpfile.php.3….
Is there any script to stop that?

]]> By: Manoa Tbakau http://www.webmasters-central.com/article-blog/tutorials/cron-tutorial-managing-cron-tab-or-cron-job-is-easy/comment-page-1/#comment-3946 Manoa Tbakau Mon, 07 Dec 2009 01:38:24 +0000 http://www.webmasters-central.com/article-blog/?p=164#comment-3946 What is the possibility for the script to be automated and at the same time be told that only when there is an Input Data, script should be executed. Like a check to be made before the script is executed. What is the possibility for the script to be automated and at the same time be told that only when there is an Input Data, script should be executed. Like a check to be made before the script is executed.

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