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1666 - Slow boot and terminal start on Linux boxes
Now this was a mystery. I had two Linux boxes which booted perfectly when used inhouse, but very slowly indeed (10 minutes plus) when in use on a customer site. Very awkward really - we would test out the systems in Melksham and find them fine, but then they would fail in Bristol. Even calling u ....

1665 - Factory method example - Perl
Utility methods (factorys) are often used to create objects which may be of any of one of a series of different classes, depending on the data passed in. Have a look at this Perl program which reads in data from a log file and creates a list of web site visit objects: use visit;   open (FH ....

1664 - Example of OO in Perl
Although Perl 5 doesn't use the words "class", "method" or "object" (or any of the other common OO words), it never the less has a very good OO model indeed - here's the source code of an example, together with the result of running the sample. I'll then give you a few clues! use train; use bus; ....

1663 - Python in an afternoon - a lecture for experienced programmers
Last Friday afternoon I was set a challenge - to present Python in three hours to a group of 20 very experience programmers who, however, knew nothing about this particular language. The session was in Central London - my directions started off with "Get off the Tube at Oxford Circus", so Londoners ....

1662 - Westonbirt Arboretum Postcode
The postcode for Westonbirt Arboretum is GL8 8QS. Why am I putting that on my blog? Because I was woken this morning - and not for the first time - by a phone call and a voice asking "what's the postcode of the Arboretum?". One of the hazards on having a strong online presence is that you'll co ....

1661 - Equality, sameness and identity - Python
Is the number 7.0 the same as the number 7.00000? A trick question, because it depends on how you look at it. It has the same value, but it is not identical. And if eachof them is held in computer memory, there's no chance at all that they're both the same thing - i.e. held in the same memory loc ....

1660 - Korn shell - some nuggets
I've presented some Korn Shell Training over the last couple of days ,,, and I cut and pasted a few snippets which I thought might be of interest. • Korn Shell - looping through a series of outputs from a command $ for file in `ls`; do > echo $file > done LinuxBasicsAdmin.book.pdf Sefas.book ....

1659 - String, Integer, Array, Associative Array - ksh variables
• In the Korn Shell, variables default to be being strings ... $ r 26 kay=7 $ r 30 while (( $kay>3 )); do echo $kay kay=$kay-1 done; 7 7-1 7-1-1 7-1-1-1 $ • ... but you can declare them as integers. $ integer kay $ kay=7 $ kay=$kay-1 $ echo $kay $ (( g = 8+8 )) $ echo $g 16 $ h=8+8 $ ec ....

1658 - Some useful variables and settings in the Korn Shell
Here are some hidden "gems" ... • -C sets "noclobber" mode in which redirects do not overwrite files $ set -C $ $ ls > fred $ ls > fred ksh: cannot create fred: File exists $ set +C $ ls > fred $ • CDPATH lets you change the target for your cd command to a list of directories whihc ar ....

1657 - Farewell, Newcastle to Stavanger, Haugsund and Bergen
I was very sad to hear on the radio this morning that DFDS are withdrawing their ferry from Newcastle to Norway - a short item and I have no detail,s but it brough back memories of a 24 hour crossing one winter a few years ago, on the "Venus" run - in those days - by Color line. Rising fuel costs ....

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