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For 2021 - online Python 3 training - see ((here)).

Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.

Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc.
Repeating tasks with crontab

Some things happen every day - or twice a day, or weekly ... in the background behind our web site - things like the rotation of log files, generation of reports and copying the Opentalk Forum into archives. We don't trigger these things manually!

On Unix and Linux systems, your crontab lets you set up jobs to be run in a regular (or irregular) pattern according to day of month, month, hour, minute and day of week. Simply use the command crontab -e on your server to edit your crontab, and insert one line per job required. For example:

11 13 * 3-9 * cp /home/wellho/summerpm.jpg /home/wellho/public_html/iotd.jpg

would copy an image called "summerpm" to an image called "iotd" at 11 minutes after the hour of 13, every day on the month, March to September only, every day of the week and:

1 2 * * 6 cp /home/wellho/weekend.jpg /home/wellho/public_html/iotd.jpg

would copy the image called weekend at one minute after 2 every Saturday morning.

Not every web space provider allows you to run crontab jobs, but if it's there for you, it's an invaluable tool. Just remember to never type in the word "crontab" on its own as it deletes all your existing jobs and replaces them with whatever you care to type at the keyboard!
(written 2005-12-27, updated 2006-06-05)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
A164 - Web Application Deployment - Services and Regular Jobs
  [907] Browser -> httpd -> Tomcat -> MySQL. Restarting. - (2006-10-28)
  [1028] Linux / Unix - process priority and nice - (2007-01-10)
  [1288] Linux run states, shell special commands, and directory structures - (2007-08-03)
  [1553] Automatic startup and shutdown of Tomcat - (2008-02-24)
  [1633] Changing a screen saver from a web page (PHP, Perl, OSX) - (2008-05-06)
  [1700] FTP server on Fedora Linux - (2008-07-06)
  [1731] Apache httpd, MySQL, PHP - installation procedure - (2008-08-01)
  [1733] memcached - overview, installation, example of use in PHP - (2008-08-02)
  [1765] Dialects of English and Unix - (2008-08-21)
  [1903] daemons - what is running on my Linux server? - (2008-11-23)
  [2145] Using the internet to remotely check for power failure at home (PHP) - (2009-04-29)
  [2182] What Linux run level am I in? - (2009-05-15)
  [3011] What are .pid files? - (2010-10-23)
  [3143] On time - (2011-01-23)
  [3791] The Kernel, Shells and Daemons. Greek Gods in computing - (2012-07-01)
  [3792] Managing daemons from a terminal session - (2012-07-01)
  [4487] Starting MySQL. ERROR! The server quit without updating PID file - how we fixed it. - (2015-05-06)


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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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