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1703 - Perl ... adding to a list - end, middle, start
You can add an extra element on to a Perl list with push, into the middle with splice and onto the beginning with unshift. You can extract a single element from splitting a scalar and calling up the element you want using square brackets and the appropriate subscript. Example: open (fh,"../../req ....

1702 - Running operating system commands in Perl
Perl is excellent "glueware" - a language which can be well used to connect together a whole lot of elements. And one of those elements may be operating system commands run from within the Perl program. Here are (three!) ways that you can do it - in each case leaving the result of running the comm ....

1701 - Training Course and Business Conference Technology
When a new technology comes out, it's described as "leading edge" - it tends to be very expensive, and whilst it functions it does so with limitations that make its adoption limited - by only those people who really need the technology and / or are prepared to put up with its restrictions. When I w ....

1700 - FTP server on Fedora Linux
Using vsftpd ... Turning on manually / for current boot 1. Log is as root 2. cd /etc/init.d 3. ./vsftpd start [trainee@melksham ~]$ su - Password: [root@melksham ~]# cd /etc/init.d [root@melksham init.d]# ./vsftpd start Starting vsftpd for vsftpd: [ OK ] [root@me ....

1699 - If you are learning Lua, here are some more examples
During some courses, I write few (if any) new examples in front of my delegates, rather relying on the standard ones in the training notes (which I wrote anyway!) and making small changes and adjustments to illustrate how things work. On other courses, though, I write a some new examples from scrat ....

1698 - Dealing with The Press
A big thanks to Bruce Williamson who held us all spellbound at yesterday's RailFuture Annual National Conference with his talk / "masterclass" on dealing with the press - something which many of "us campaigners" have learned the hard way. Bruce has many years of experience on both sides of the micr ....

1697 - Sorting in lua - specifying your own sort routine
In Lua, the table.sort function allows you to sort a table and by default is sorts into the order that's given back by the < operator on each of the objects to be sorted. If you want to override this behaviour, you can pass the name of a function into Lua's sort and it will call this function eac ....

1696 - Saying NOT in Perl, PHP, Python, Lua ...
"Isn't there one standard way to say NOT?" asked one of my delegates on today's course - and it's an excellent question. But the answer to a question about a negative subject is itself in the negative - no, there isn't just a single way! In fact .. I can think of no fewer that 12 ways! • 1. ! ....

1695 - Lua Course - here is the index
If you want to look something up in a book, you'll probably use the index. And so it is in Lua that if you want to look something up in a table (the collection structure in Lua), you'll use an index too. We have just announced our Public Lua Course - it's a natural for us, as we specialise in nich ....

1694 - Defensive coding techniques in PHP?
I used to write CAD system software (many moons ago), and when doing so I used what I call "defensive coding techniques". Which meant that I never trusted user input, that a file would be available, that I could write correctly to a device - I tested, tested and tested again. In our environment, i ....

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