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1650 - Looking for files with certain characteristics (Linux / Unix)
I was about to use chown to change the ownership of an entire subdirectory tree that had been passed from one user to another. But - hang on - were there any files there that belonged to someone else for any reason? One way to find out - a find command: find . -not -user savethetrain -print " ....

1649 - Easy conversion - image formats, currencies and distances
If you're converting between distances (inches, feet, metres, centimetres, metres, furlongs or perches), between currecies (dollars, euros, pounds, roubles, lira) or between graphic file formats (.jpg, .png, .gif, .xbm, .tiff), chances are you'll have any one of a large number of different inputs to ....

1648 - The tourists guide to Linux
When visitors come to this country for a touring holiday, they'll land at Gatwick and take in London, Stonehenge, Bath, Stratord-upon-Avon, York (pehaps) and Edinburgh. That will give them a flavour but none of the details (and of course they'll miss gems such as Melksham and Radstock). But they ....

1647 - Exchange Rates - PHP with your prices in your users currency
Would you like to tell your user what your product will cost in his local currency? What a great idea, except that exchange rates change! The European Central Bank, though, makes a file of exchange rates betweenthe Euro and other currencies avaialble abnd publicly accessible, and you can pick thi ....

1646 - Using cookies and sessions to connect different URLs - PHP
One of the great beauties of cookies (and derived from that, of PHP sessions) is that they can be used across a series of pages on the same server - indeed we use cookies on this site to record our visitor's preferences for colour, font size, country and open source langauge(s) via our user preferen ....

1645 - Seeing how others do it - PHP training
We're always keeping an eye open for "how others do it" - we're quite happy to learn from others in the training business. But more often than not, we'll spot something and say "I would never do THAT" or "that wouldn't work for us". Here are some I found on a single site this morning. "All of ou ....

1644 - Using a utility method to construct objects of different types - Python
When you call an object's constructor method, you'll be allocating memory to hold the information about that object and the method will return an instance variable - a reference with which you can later refer back to the object. That's good as far as it goes - but there are times when you'll have d ....

1643 - A lack of technical content
There were two emails in my inbox on Thursday, receive within a few minutes of each other> "Going mad here" says one as its subject line; "boom or bust - is the training industry on the verge of a recession" asks the other. The first was from Lisa, reporting that the enquiries and admin were flowi ....

1642 - Summer!
Summer came at the start of this week ... here are Monday, Tuesday and Wednesday pictures - at the Barge at Seend, with the Chamber of Commerce meeting in the garden at Well House Manor, and at lunch on the Python course on Wednesday when we couldn't resist grabbing a picnic and going and seeing th ....

1641 - Tektronix 4010 series / Python Tuples
The Tektronix Storage Tube was a cathode ray screen across which a beam of electrons could be swept directed, leaving a trail behind it rather like the plume behind an aircraft (technology note). The technology was developed further to allow the picture generated to be held on the screen for quite ....

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