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USB Port Replicators
by Jim Rippon 02 Dec '11

02 Dec '11

Hi everyone, I'm wondering if anyone has had any luck or otherwise with USB Port Replicators - and specifically the sound and serial outputs on them. I've a system at home that lives underneath my desk, but has no sound card, but given my radio is on the blink I was looking at getting some use out of my mp3 collection and rediscovering some old tunes. Looking at something like the following ebay lot: http://www.ebay.co.uk/itm/Targus-Mobile-USB2-0-Port-Replicator-PAEPR092E-NE… Appreciate any feedback :) Jim

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Energy monitoring
by Mark Rogers 01 Dec '11

01 Dec '11

I'd like to play with one of the various energy monitoring gadgets that seem to be everywhere these days. I'm looking for one that will transfer data to my PC, and obviously that PC is running Linux (Ubuntu 11.04 at the moment, not sure if it will go to 11.10 yet...) Any suggestions/recommendations? I'm as lazy as they come so ideally I'm looking for something that can be permanently connected to my PC (therefore presumably a wireless connection will be involved at some point); I don't really want a box that collects data that I then take to my PC to download it once a week/month/year/never. And I'm also looking for access to the raw data, but also suggestions for suitable GUIs welcome too. Mark -- Mark Rogers // More Solutions Ltd (Peterborough Office) // 0844 251 1450 Registered in England (0456 0902) 21 Drakes Mews, Milton Keynes, MK8 0ER

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Any PHP PDO/Sqlite experts here, can't fathom this error message
by Chris Green 28 Nov '11

28 Nov '11

I'm flummoxed by this error, even worse is that the code seems to work sometimes but I can't see any pattern in the data that causes it. The code is as follows:- try { $insQuery = "INSERT INTO log "; // $insQuery .= "(seqno, year, month, day, hour, minute, waterway, pk, place, distance, eng_hrs, fuel_cm, fuel_lt, note, type, sailing)"; $insQuery .= "(seqno, year, month, day)"; $insQuery .= " VALUES "; // $insQuery .= "(:seqno, :year, :month, :day, :hour, :minute, :waterway, :pk, :place, :distance, :eng_hrs, :fuel_cm, :fuel_lt, :note, :type, :sailing );"; $insQuery .= "(:seqno, :year, :month, :day);"; $st = $db->prepare($insQuery); foreach ($rows as $row) { $row['seqno'] = $seqno++; $st->execute($row); } $st->closeCursor; } catch (PDOException $e) { dbglog("PDO() insert error" . $e->getMessage()); dbglog("insquery: $insQuery"); foreach($row as $k=>$v) { dbglog("k is: $k, v is $v"); } } ... and what I'm seeing in the log is:- 13:53:59 192.168.1.4: PDO() insert errorSQLSTATE[HY000]: General error: 25 bind or column index out of range 13:53:59 192.168.1.4: insquery: INSERT INTO log (seqno, year, month, day) VALUES (:seqno, :year, :month, :day); 13:53:59 192.168.1.4: k is: year, v is 2011 13:53:59 192.168.1.4: k is: month, v is 11 13:53:59 192.168.1.4: k is: day, v is 12 13:53:59 192.168.1.4: k is: hour, v is 10 13:53:59 192.168.1.4: k is: minute, v is 00e 13:53:59 192.168.1.4: k is: waterway, v is 13:53:59 192.168.1.4: k is: pk, v is 13:53:59 192.168.1.4: k is: place, v is Cappy 13:53:59 192.168.1.4: k is: distance, v is 13:53:59 192.168.1.4: k is: eng_hrs, v is 2695.3 13:53:59 192.168.1.4: k is: fuel_cm, v is 8.5 13:53:59 192.168.1.4: k is: fuel_lt, v is 13:53:59 192.168.1.4: k is: note, v is Engine started after replacing blown mega-fuse, all OK otherwise 13:53:59 192.168.1.4: k is: type, v is TEF 13:53:59 192.168.1.4: k is: price, v is 13:53:59 192.168.1.4: k is: sailing, v is 1 13:53:59 192.168.1.4: k is: seqno, v is 0 So what does "General error: 25 bind or column index out of range" actually mean, I could find nowhere that explains it. Now my guess is that it's telling me that I have a column name wrong somewhere but my 'log' table definitely has columns year, month, day and seqno of the correct type. Maybe I have the syntax wrong somehow for the VALUES() bit but again I can't find any really good explanation of exactly what the syntax is, it seems decidedly woolly. -- Chris Green

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Any WordPress users here - is it really this awful to change a WordPress domain?
by Chris Green 24 Nov '11

24 Nov '11

I've been developing a simple web site for someone using WordPress (along with zillions of others I believe). I've now discovered that it is horrendously awful to move it to another domain! Not only are links in WordPress absolute but there are also loads of database entries which have the absolute URL in them. So one has to fix all the links in pages one has created *and* one has to search through the database and fix URLs there too. Aaaarrrrgggghhhh!!!! Setting the 'WordPress Address' and the 'Site Address' on the dashboard settings page only fixes URLs generated by the code (i.e. the menu links to pages). Apart from anything else it makes doing maintenance/development a nightmare. Is there any way around this or is the only approach for maintenance to have two parallel sites one 'development' and one 'live' where one tries out changes on the development site and then repeats them (hopefully correctly) on the live site. -- Chris Green

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Clam
by Bev Nicolson 23 Nov '11

23 Nov '11

Now it may be that I've missed something obvious here but I've got Clam installed but can't see anyway of running it, either with mouse clicks or otherwise. How do I do that? (Lucid, 10.10) Bev.

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bash getopt
by samwise 21 Nov '11

21 Nov '11

Hi, Has anyone done anything with GNU enhanced getopt in bash to process incoming command line parameters? My understanding is that I have the choice of using the built-in "getopts" command within bash (on a CentOS 5.3 derivative distro), which doesn't support long options (e.g. --long-option as opposed to -l), or I can use the getopt (enhanced) 1.1.4 binary which lives in /usr/bin/getopt. I want to use long options, so I'm using the GNU getopt binary. An example script is below. Note that there is one oddity - for compatibility with some other related scripts, I need the first parameter to be something else ... so the first few lines are intended to munch $1 and pass all the remaining parameters to getopt. I don't think that should affect anything, but I've left it in as that's how I'm currently testing it. My problem is that I don't seem to be able to get the parsing to work as I expect. Specifically: # ./cmd.sh . -i -o 1 input -i is -o So the problem here is that it's quite happy to set the required parameter for -i to be -o ... when actually I was expecting it to catch that -i was missing a parameter. I think I had this working using getopts, but I need to be able to support long options now. I've messed around a bit with several different ways of writing the case script, but not managed to get it working any better. So, idle question ... has anyone got a script like this where the error checking is a bit more robust than the sample below? Cheers, Peter. #!/bin/bash paramArray=("${@}") unset paramArray[0] paramArray=("${paramArray[@]}") getopt -T if [ "$?" != "4" ]; then echo GNU enhanced getopt not detected. Quitting ... exit 1; fi # Override defaults with incoming parameters, if specified PN=`basename $0` ARGS=`getopt --name "$PN" --longoptions input:,output:,noshort:,verbose --options i:o: -- "${paramArray[@]}"` if [ $? -ne 0 ]; then echo "Invalid option specified or expected parameter argument missing. Quitting ..." exit fi eval set -- "$ARGS" while [ $# -gt 0 ]; do case "$1" in -i | --input) echo input $1 is "$2"; shift;; -o | --output) echo output $1 is "$2"; shift;; --noshort) echo noshort $1 is "$2"; shift;; -v | --verbose) VERBOSE=yes; shift;; --) shift; break;; esac shift done exit;

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Relative risks of different ports/services being open
by Chris Green 21 Nov '11

21 Nov '11

I'm wondering what are the relative risks of the different ports I have opened up on my firewall. Currently the ports I have open are:- 22 - ssh (but limited to only allowing two IP addresses to connect) 80 - http 25 - smtp 873 - rsync (not sure if I actually use this now, must check!) I'm considering what the risks of opening up port 443 (https) are to use with shellinabox and ssh. This would allow ssh from a web browser anywhere into my desktop machine (in addition to https access to the apache server of course), is this a significantly bigger risk than the limited ssh access that I have now? My thinking is that the port 443 access to ssh *is* significantly riskier than my existing ssh access, however I'm not sure if I'm being overly paranoid given that I already have open access on port 80 to my web server. What I'm really asking is whether worrying about open ssh access (with a good secure password) is a bit irrelevant given that port 80 is open to web browsers? Or is the damage that could be done if someone *does* guess my password (or it gets out by some other means, quite possible) for ssh much worse than anything using a browser/apache exploit? Any/all help appreciated, including ways that I could limit the shellinabox access to specific clients. As it is the client I'm thinking of is my Kindle but nothing at the shellinabox end can see anything to do with the Kindle because the proxying in between effectively anonymises the connection. -- Chris Green

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[ALUG Announce] 3rd Monday Monthly Ipswich Social Meeting : McGintys, Northgate Street
by samwise 21 Nov '11

21 Nov '11

ALUG Announce Please send announcements to Announce(a)lists.alug.org.uk Unsub, change settings via http://lists.alug.org.uk/mailman/listinfo/announce ----- The monthly "Third Monday" ALUG Ipswich Social Meeting is back tonight, Monday 21st November, at 20:00: P J McGinty & Sons 15 Northgate Street Ipswich Suffolk IP1 3BY Tel: 01473 251 515 Map/Directions URI: http://maps.google.co.uk/?q=IP1+3BY WWW: http://www.pjmcgintys.co.uk/ McGintys pub is in the centre of Ipswich. It's directly opposite the town's central library and has a reputation for good Irish beer. We're usually to be found in the lowest section of the bar, near the library entrance to the pub. All are welcome, novices and experienced users. Feel free to ask for further information on the Main ALUG mailing list. Peter. ----- Send discussion replies to main(a)lists.alug.org.uk (Reply-To set) Unsub, change settings via http://lists.alug.org.uk/mailman/listinfo/announce

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How can I deny certain countries access to my website
by Ian Douglas 19 Nov '11

19 Nov '11

For about a month one of my websites (or rather the "Contact Us" form on that website) has been under regular, daily, attack from hackers. The attacks are consistently coming from IP Addresses in Rumania and Russia. Each time an attack occurs I use my webhost's cPanel to manually add the IP to my cPanel "IP Deny Manager" list. This is however becoming rather tedious and time consuming and seems the wrong way round to do things as I am denying IP Addresses AFTER they have tried to hack in rather than blocking them BEFORE they attempt it. Is there a way I can simply deny access to my website (or, better, just it's home-made PHP based "Contact Us" form) to all Eastern European visitors? Alternatively, since my website is primarily focused on UK customers, would there be an easier way to deny all visitors access unless they came from UK, USA Canada, Eire or Australia? I realise that this is not specifically a Linux question but any suggestions would be welcome. Ian.

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How to diagnose problem with special characters in a 'shellinabox' ssh login?
by Chris Green 19 Nov '11

19 Nov '11

I have set up shellinabox on my home system to allow me to connect from the web browser in my Amazon Kindle. I have it working OK to the extent that I can log in as a user whose password has no special characters in it, so the basic communications and connections are working. However my own password has non-alphanumeric characters in it and when I try and log in from the Kindle using shellinabox it always fails authentication. It fails if I log in directly or if I try and 'su -' from the login that I can do successfully. Logging in to shellinabox from Firefox works OK. So the Kindle->shellinabox connection is losing/changing something. When I type the non-alphanumeric characters in the working login they are echoed correctly so it's down to something in the interaction with login I think. Can anyone suggest a way of diagnosing this? -- Chris Green

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Apache2 magic
by Barry Samuels 17 Nov '11

17 Nov '11

I have set up a second virtual site on my computer so that I can use www2 instead of www because that's already used and I want to keep it separate. I have a very simple html page in www2 and this is the exact code: <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">  <html> <head> <title>6 Hour Live data usage</title> <meta http-equiv="refresh" content="10" > </head> <body> <img width="1250" height="800" src="/graphs/Power-6hr.png"> </body> </html> Notice the meta tag in the header which refreshes the page every 10 seconds. If I access this page with a web browser as a file i.e. file/// it works as expected, although I have to change the src= path to include / var/www2, but if I access it using http:// it doesn't update and if I use 'view/page source' I see that: <meta http-equiv="refresh" content="10" > has been replaced with: <link rev="x-refresh" href="" > Why should that happen? -- Barry Samuels http://www.beenthere-donethat.org.uk The Unofficial Guide to Great Britain

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BOINC
by Chris Walker 14 Nov '11

14 Nov '11

I've recently installed (using the app manager and not by command line) the boinc program on my Mandriva machine but it's not connecting. I'm stuck now despite looking at the help pages. The manager program fires up and tried to connect to localhost and fails. If I click on the various tabs, it shows that 0 bytes of disc space are being used because it's not connected to any projects. But all the commands under the Projects tab are greyed out. So does anybody have any ideas where I'm going wrong please and what I need to to fix it? -- __ __| |_ __ __ .----------------------------------------------. / _/ _` \ V V / | mailto:cdw_alug@the-walker-household.co.uk | \__\__,_|\_/\_/ |______________________________________________|

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Re: [ALUG] Need to add remote screen to linux box
by Mark Rogers 14 Nov '11

14 Nov '11

On 09/11/11 17:29, Tony Tibbenham wrote: > Or you could go for something like > http://www.fit-pc.com/web/fit-pc2/testimonials/ for a truly tiny PC Thanks for this, I think this one looks pretty promising: http://fit-pc.co.uk/Trim_Slice_Value--product--41.html -- Mark Rogers // More Solutions Ltd (Peterborough Office) // 0844 251 1450 Registered in England (0456 0902) 21 Drakes Mews, Milton Keynes, MK8 0ER

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Re: [ALUG] Energy monitoring
by Mark Rogers 14 Nov '11

14 Nov '11

On 14/11/11 11:23, Andy Taylor wrote: > Take a look at this - > http://www.retrocomputers.eu/2011/01/11/how-much-electricity-are-you-using/ > > Software logs to a MySQL database with a web front end. My meter is > connected to my server via a serial to USB cable. Thanks, that looks like the sort of thing I'm after. I've found what I hope is a suitable meter on eBay and will have a play. -- Mark Rogers // More Solutions Ltd (Peterborough Office) // 0844 251 1450 Registered in England (0456 0902) 21 Drakes Mews, Milton Keynes, MK8 0ER

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Network magic
by Barry Samuels 13 Nov '11

13 Nov '11

My computer has two network interfaces, eth0 (wired) and wlan0 (wireless), to connect to my router. The wired connection goes via a small network switch to which a laser printer is also connected. The computer normally uses the wired connection but sometimes I need to disconnect that and use the wireless so that I have a wireless connection to the router but the cable is disconnected from the router leaving my computer connected to the switch which also has a laser printer connected to it. Is there any way that I can use the laser printer via eth0 when my computer is running on wireless? -- Barry Samuels http://www.beenthere-donethat.org.uk The Unofficial Guide to Great Britain

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Need to add remote screen to linux box
by Mark Rogers 10 Nov '11

10 Nov '11

I have (or will have) a small Linux server running a minimal desktop distro and web server. The server will be used daily by someone sat next to it (using a web browser). In addition, I need to put a 42" display elsewhere in the building which will use a web browser to show a page from the same server. There'll be no local mouse or keyboard. There may be more than one such display in future. Any good options? Presumably I could use an extra video card for a second display (not sure the server will have a spare slot but maybe a USB video card would do) and run everything from the server, however I don't think I can be sure to stay within distance limits for USB. On the other hand I could just stick a PC with the 42" display, but that would be overkill. Having something that sat on ethernet (and perhaps could be configured via SSH) would be ideal, I'm just not sure what exists? Note that the web application makes use of jQuery and AJAX so it may place some limitations of the choice of browser. The ability to restart the browser periodically would be useful, knowing how they all seem to leak memory! -- Mark Rogers // More Solutions Ltd (Peterborough Office) // 0844 251 1450 Registered in England (0456 0902) 21 Drakes Mews, Milton Keynes, MK8 0ER

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basic question about scripts, change user in midstream
by James Bensley 09 Nov '11

09 Nov '11

Hi Peter, I dont understand exactly what you're getting at here. Is the -u option of the `sudo` command what you're after? sudo -u fred whoami This would echo "fred". James.

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basic question about scripts, change user in midstream
by Peter Alcibiades 09 Nov '11

09 Nov '11

How do I change user in a script, and then carry on with the task at hand? What I need to do is get the user to su to root, give the password of course, then carry on. For instance: su [and this then prompts for his password of course] cd /home/fred/Desktop [ now I would get him to enter a file name of a folder on his desktop and then...] chown -R fred filename What happens when I try this is that after changing accounts, the script stops. Very basic question.........., sorry. Peter

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[ALUG Announce] ALUG Norwich Pub Meet Thursday 10th November
by Viperfang 07 Nov '11

07 Nov '11

ALUG Announce Please send announcements to Announce(a)lists.alug.org.uk Unsub, change settings via http://lists.alug.org.uk/mailman/listinfo/announce ----- Hello Aluggers, Our monthly ALUG Norwich social meeting will be held this Thursday, 10th November at The Coach and Horses (82 Thorpe Road, Norwich, NR1 1BA). The meeting officially starts at 8pm, although some people may arrive earlier. More information on those people can be found on the list and the IRC channel. If you are unsure if you will recognise us then make yourself and your intent to attend known by either posting on list or visiting us on IRC so we can look out for you rather than hiding in the corner. Optionally you could ask at the bar if they know where the geeky computer weirdos are and they'll point you in the right direction (seriously!). Another possibility is look for heaps of electronics on a table that may possibly look like movie props that would used for detonating explosives. Feel free to bring electronics/laptops/gadgets to the meet, you will by no means be alone. Ben Bewick aka Viperfang NB: This mail is automated, please refer to the usual sources for more information. ALUG Contact Details: Website : http://www.alug.org.uk/ IRC : #alug on irc.alug.org.uk List : http://lists.alug.org.uk/mailman/listinfo Twitter : http://twitter.com/anglianlug Identica: TBA Facebook: http://www.facebook.com/group.php?gid=2381613902 ----- Send discussion replies to main(a)lists.alug.org.uk (Reply-To set) Unsub, change settings via http://lists.alug.org.uk/mailman/listinfo/announce

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A more subtle (?) sqlite (or actually just SQL) question
by Chris Green 06 Nov '11

06 Nov '11

I have a database which, among other things has a date column and also has some text columns. Is there any way to ask for:- The value of a text column for the last date less than the current date E.g. I have data like the following:- Date Text --------- --------- 2011-11-4 Cabbages 2011-11-5 Fireworks 2011-11-7 Nutcase and I want the result 'Fireworks' given the date 2011-11-6. SELECT Text from db WHERE Date < '2011-11-6'; will give all previous rows, not just the row I want. I sort of need to to say:- SELECT Text from db WHERE Date 'is the biggest one less than' '2011-11-6'; I guess I can do:- SELECT Text from db WHERE Date < '2011-11-6' ORDER BY Date DESCENDING; and use the first row returned but this somehow seems inelegant. Does anyone have any better ideas? -- Chris Green

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How to work out what "SQLSTATE[HY000]: General error: 25 bind or column index out of range" actually means
by Chris Green 06 Nov '11

06 Nov '11

I'm getting this error when using PHP's PDO to insert records into an sqlite3 database. It's only happening on some inserts. SQLSTATE[HY000]: General error: 25 bind or column index out of range Now I realise it's probably telling me that some column constraint is being contravened or maybe that I have an invaldid column name or something in the insert. However I can't work out what the error is and without some sort of pointer as to which column (or whatever) is causing the problem I'm at a bit of a loss to find the error. The insert query string being handed to the prepare() function is:- INSERT INTO log (seqno, year, month, day, hour, minute, waterway, pk, place, distance, eng_hrs, fuel_cm, fuel_lt, note, type ) VALUES (:seqno, :year, :month, :day, :hour, :minute, :waterway, :pk, :place, :distance, :eng_hrs, :fuel_cm, :fuel_lt, :note, :type ); and the execute query is being handed an array with matching keys. I'm *wondering* if the issue may be that a couple of fields have characters like '-' and ',' in them, do I need to quote or escape these maybe? -- Chris Green

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HTML question - any way to do this other than using tables?
by Chris Green 02 Nov '11

02 Nov '11

I know HTML isn't strictly linux, but still it's related isn't it and there are lots of clever and helpful people here. I want to lay out some web pages in the following sort of fashion:- Top of Page Heading Sub-heading C1 Data C2 Data C3 Data More C1 data More C2 data More C3 data Sub-heading C1 Data C2 Data C3 Data More data More data More data and more etc etc Sub-heading Etc. Etc. Etc I want all of the columns under the sub-headings to be the same widths so they're aligned all the way down (i.e. the same column widths under all of the sub-headings). Using tables one could either set all the column widths explicitly (but very difficult to make it work at different resolutions then) or one could make the sub-headings a column span and just make the text bold (so as a result it's all one table). Is there any other way that would be less painful? I suppose using the column spanning method isn't too awful but it's a really pity that HTML has no other way of putting text in columns. Note that the columns are not all the same width as I have shown above. -- Chris Green

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Problem 2 - System won't start again after CMOS battery failure
by Chris Green 01 Nov '11

01 Nov '11

I have a fairly infrequently used system in our lounge that I use occasionally when I want to display stuff on the telvision. Yesterday it failed to boot when I tried to use it so, after a few failed retries I went and got my laptop. As per "Problem 1" *that* wouldn't connect to the WiFi. To get round the immediate problem I got a long patch cable and connected that way, so we could see the pictures I wanted to show on the TV! So, I'd like to get the dead CMOS system back up and running. I've replaced the CMOS battery and loaded "Optimised defaults" into the CMOS. That didn't initially work at all because it didn't enable the SATA ROM and the system, though a few years old, has just one disk drive which is a SATA disk. I've now enabled the SATA disk and the SATA ROM in the CMOS and it gets a bit further, GRUB comes up and offers me three or four kernel versions plus memtest. Memory checks OK. If I just let it go on to the default kernel it pops up the disk ID, thinks for a while, then pops up the disk ID again with "Starting system" below, and that's it. I tried the recovery mode and it looks as if it can't read the SATA disk drive, though obviously the CMOS can as otherwise it wouldn't boot into GRUB at all. It goes through a load of timeout messages and then there's a kernel panic. I was going to try and produce some detail by copying to my laptop but that's waiting for the solution to "Problem 1"! Is there any way to copy/save the boot messages produced by GRUB in recovery mode so I can Google for them and/or show them here so that someone might be able to decipher what's wrong? ... and/or can anyone suggest something deep in the CMOS settings that might have been lost and is necessary for Linux to boot from SATA successfully? It's running Xubuntu 10.10 (I think!). -- Chris Green

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Android phone management with Linux
by Mark Rogers 31 Oct '11

31 Oct '11

What is the best way to manage my Android phone with my Linux (U11.04) desktop? I don't currently use it for music etc, and all the stuff I've found so far seems to focus on syncing to banshee. I'm more interested in contacts, SMS/MMS, and maybe photos (I say "maybe" because it's easy enough to just drag photos off via USB anyway). I'm not particularly looking to sync the contacts etc with something else, just back them up, although sync would be fine. (Specifically: I went to NY recently and got a local PAYG SIM for the duration, then lost my UK SIM, so I now have a new SIM and have discovered just how many of my contacts were on the SIM not on the phone... Also, for the contacts that were on the phone it was obvious when I tried using them in NY just how many were prefixed 0nnn rather than +44nnn and a way to easily edit them all would be nice.) Also I'd like to archive off my SMS messages, so again it's not really about sync but just backup. Phone is an HTC Desire HD, although I will probably replace it with a newer Android (Samsung Galaxy S2 looking likely) in the near future. -- Mark Rogers // More Solutions Ltd (Peterborough Office) // 0844 251 1450 Registered in England (0456 0902) 21 Drakes Mews, Milton Keynes, MK8 0ER

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Agile East Anglia
by Paul Grenyer 30 Oct '11

30 Oct '11

Hi All I've not been around here for a while, but now I'm back! And I'm promoting a new group in Norwich which I suspect would be right up some people here's street. Inspired by the Extreme Tuesday Club (XTC) in London, Agile East Anglia's intention is to organise regular informal meetings for people new to Agile, Agile practitioners and Agile experts to meet, discuss ideas and network. I'm hoping to arrange the first meeting in late November at the Coach and Horses on Thorpe Road in Norwich. http://www.linkedin.com/groups/Agile-East-Anglia-4149630 -- Thanks Paul Paul Grenyer e: paul.grenyer(a)gmail.com b: paulgrenyer.blogspot.com t: pjgrenyer

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