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431 - File permissions of Linux and Unix systems
What does -rwxr-x--- mean in the output of a Linux ls (list symbols) command? The first character indicates the type of file system object that the line describes, and the commonly found characters are: -A regular file dA directory lA symbolic link You then have three groups of three characters, ....

430 - Linux commands - some basics
DoscommandLinuxcommandDescription File basics copycpCoPy file(s) renmvMoVe (rename) file(s) delrmReMove (delete) file(s) dirlsList files / Symbols Working on file contents -fileWhat's in a file? typecatDisplay file contents | moremoredisplay file page by page -head, tailDisplay start, end of file - ....

429 - Charlie on Monday
I thought that those of you who've been here on a course (or have visited us otherwise) might like to see how Charlie spent her Bank Holiday Monday afternoon ... ....

428 - Swindon - Chippenham - Melksham - Trowbridge - Westbury train service
When I talk on a subject, I prefer to do so from a strength of knowledge. So, as I'm campaigning for the continuation of the our train at its current level, Lisa and I went down to the local station at Melksham yesterday to see how much traffic there was on a Sunday afternoon. And ... on something ....

427 - The Melksham train - a button is pushed
Bank Holiday Sunday, and all is quiet? Not quite! I've just been interviewed over the phone by Great Western Radio about my Save the train website. In its first two weeks, the site has attracted over 200 different visiting hosts (I think that's a fairer statistic to quote than hits!), and 20 or 3 ....

426 - Robust checking of data entered by users
10 steps to testing the bullet proofing user inputs or how to avoid being caught by nasties when your script goes live! 1. Test it works with intended entries. It's not going to be much good if it falls over when someone entered a valid piece of data! 2. Test it works (fails correctly) with errone ....

425 - Caching an XML feed
If you're using PHP to add a newsfeed to your site, please be kind to the news feed supplier and cache the feed if your page is a popular one. I posted a couple of weeks ago ... a link to a piece of code that grabs a news feed .... and I've enhanced it now to do the caching. Here's the modified c ....

424 - How not to run a forum
I'm willing to invest time and energy into something I believe in, but I want to make sure that it's worth my while .... that I'm not wasting my time. I came across a local forum ... quite quiet, but nevertheless a useful and targeted spot onto which to post a message about a local issue; I filled ....

423 - A Victorian Lady
My Grandmother - "Gran" - would have been 112 today. She was born when Victoria was on the throne and when the professional classes lived in bigger houses and had servants to help with the running of the place. My early memories are of a sliding door to their kitchen in Ainsdale, Lancashire when my ....

422 - PHP Magic Quotes
Do you want to read a string from a form and save it into a database? "Easy" you might say ... and indeed it is ... but if you just take the exact characters that were entered into the form and embed them in your SQL, you're laying yourself open to an injection attack. That's where a user enters a ....

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