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2639 - su or su - ... what is the difference?
If you're wanting to do admin work on a Unix or Linux system, you'll probably need to be logged in as the administrator. However, you're likely to find that you're not allowed to log in as root directly, and that you have to use the su command. Strictly speaking, "su" stands for "Substitute User" ....

2638 - Finding what has changed - Linux / Unix
If you want to find out what has changed in a file, use the diff command. And if you want to find out what has changed across a whole directory structure, use diff -r If I want to compare a backup with my current system - to see what has been altered (perhaps when something has gone wrong and I wa ....

2637 - Courses - Melksham and elsewhere - until the end of April
I'm usually well scheduled a few days ahead, but as I look further ahead, things are less certain. Extra private courses are booked, "options weeks" resolve into a decision as to which course we'll be running, and occasionally courses are switched around / added to in order to meet delegate's requi ....

2636 - Linux - useful tips including history and file name completion
Linux is feature rich - it's so feature rich that it's daunting to know where to start when teaching about it - what features to include and what to leave out. It's twenty to nine at night, and I'm still hear in "The Wilts" training room, just getting down to "the Mouth" which I would have expected ....

2635 - A PHP example that lets your users edit content without HTML knowledge
Scenario one. I need a "todo" list page for our web site which I, and the rest of our team, can view and update quickly and easily. Scenario two. Dave wants to provide his local cricket club's website with pages that the committee can update without them having to be trained / skilled in HTML, wit ....

2634 - London to and from Melksham by public transport
Melksham is a town with a population of around 25,000 people located around a hundred miles to the West of London. It's the home of Well House Consultants, our open source training company, and many other businesses too ... and a great place to visit for a few days away as well. London to Melksham ....

2633 - Why do I teach niche skills rather than mainstream?
Being able to drive a car is a far more useful skill for me (personally) than being able to service that same car would be. And having the life skills to live in a house is far more of a mainstream thing than being able to actually build that house. But that doesn't mean that there's no call for p ....

2632 - Shipping a test harness with your class in PHP
If you're writing a class (or group of classes) into a file you include into your main application(s) in PHP, you'll be recommended to keep the included files out of the document path so that they can't be run on their own (or, more dangerous, browsed as text if you have a different extension applie ....

2631 - How to show a large result set page by page in PHP
One of the major requirements on dynamic web pages is for them to present selected results from a data set. If the results will nicely fit on one page, that's good - but if there are too many for a single page they should be offered page by page, with links to move forward and back, and to the beg ....

2630 - Static variables and ampersands in PHP
If you call a function within your program, the last thing you usually want is to have the debris from a previous call left over and effecting how it runs. The fact that you previously looked for a florist in Melksham should not effect your search for a brewer in Devizes, and asking for the averag ....

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