For 2023 - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.
Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!
I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
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
. 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 articlesA164 - Web Application Deployment - Services and Regular Jobs 
Browser -> httpd -> Tomcat -> MySQL. Restarting. - (2006-10-28) 
Linux / Unix - process priority and nice - (2007-01-10) 
Linux run states, shell special commands, and directory structures - (2007-08-03) 
Automatic startup and shutdown of Tomcat - (2008-02-24) 
Changing a screen saver from a web page (PHP, Perl, OSX) - (2008-05-06) 
FTP server on Fedora Linux - (2008-07-06) 
Apache httpd, MySQL, PHP - installation procedure - (2008-08-01) 
memcached - overview, installation, example of use in PHP - (2008-08-02) 
Dialects of English and Unix - (2008-08-21) 
daemons - what is running on my Linux server? - (2008-11-23) 
Using the internet to remotely check for power failure at home (PHP) - (2009-04-29) 
What Linux run level am I in? - (2009-05-15) 
What are .pid files? - (2010-10-23) 
On time - (2011-01-23) 
The Kernel, Shells and Daemons. Greek Gods in computing - (2012-07-01) 
Managing daemons from a terminal session - (2012-07-01) 
Starting MySQL. ERROR! The server quit without updating PID file - how we fixed it. - (2015-05-06)
Some other Articles
San FranciscoTaking the dog for a walkThe relevance of the hairy woodpeckerIs training seasonal?Repeating tasks with crontabThe world didn't stop for ChristmasMorning image, afternoon imageChristmas is for everyoneChristmas Partyrich and famous
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This is a page archived from The Horse's Mouth at
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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