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by tdenson
Thu Mar 19, 2015 2:21 pm
Forum: Teaching and learning resources
Topic: Looking for learning resources age 3-6
Replies: 6
Views: 2886

Re: Looking for learning resources age 3-6

Actually when I looked into this it only seemed to be unstable when I was connected via VNC. When I plugged in a KB and monitor all was well, so no worries. It looks a great package and just what I was looking for.
by tdenson
Wed Mar 18, 2015 10:01 pm
Forum: Teaching and learning resources
Topic: Looking for learning resources age 3-6
Replies: 6
Views: 2886

Re: Looking for learning resources age 3-6

Yes, GCompris looks just the ticket. I have installed it on a B+ and all seems fine, however when I run it on a Pi 2 it crashes frequently. Do you think there'll be a new version pretty soon ?
by tdenson
Wed Mar 18, 2015 11:39 am
Forum: Advanced users
Topic: Citrix Xen Desktop
Replies: 1
Views: 1033

Citrix Xen Desktop

I am replacing some ancient Windows PC in a school in Africa with some Raspberry Pis. Until I can source alternative educational software to replace the Windows XP stuff they are currently running I am looking at alternatives approaches. One possibility I have come across is to run a single windows ...
by tdenson
Wed Mar 18, 2015 8:45 am
Forum: Teaching and learning resources
Topic: Looking for learning resources age 3-6
Replies: 6
Views: 2886

Looking for learning resources age 3-6

I am currently engaged in a project for a school in Kenya where I have committed to replacing 5 ancient PC's with 5 Raspberry Pis. They are currently running Windows programs such as Millie S Math House and "Starting to Read". I am looking for equivalent early leaning apps for the Pi. Can anyone poi...
by tdenson
Mon Mar 16, 2015 4:48 pm
Forum: Advanced users
Topic: VNC reverse connection
Replies: 11
Views: 3502

Re: VNC reverse connection

Got it working now, I think it was a Windows firewall issue.
by tdenson
Mon Mar 16, 2015 4:00 pm
Forum: Advanced users
Topic: VNC reverse connection
Replies: 11
Views: 3502

Re: VNC reverse connection

OK, have changed port to 5501, but still nothing happens. Not sure if I have the right sequence for things - I start the server first, and then start the viewer in listening mode.
by tdenson
Mon Mar 16, 2015 3:06 pm
Forum: Advanced users
Topic: VNC reverse connection
Replies: 11
Views: 3502

Re: VNC reverse connection

Thanks for the replies, however I am still struggling. After reading the links above I tried the following - On the Pi, started up the VNC server with "tightvncserver" Then vncconnect -display :1 xxx.xxx.xxx.xxx:5500 (where xxx.xxx.xxx.xxx is the ip address of my listening viewer) Started a viewer f...
by tdenson
Mon Mar 16, 2015 8:48 am
Forum: Advanced users
Topic: VNC reverse connection
Replies: 11
Views: 3502

Re: VNC reverse connection

Thanks. My obvious next question is - how ? I have Googled for command line options for the Raspberry Pi version of TightVNC and drawn a blank.
by tdenson
Sun Mar 15, 2015 10:14 pm
Forum: Advanced users
Topic: VNC reverse connection
Replies: 11
Views: 3502

VNC reverse connection

I want to run a VNC reverse connection from a Pi (set up the VNC Server on the Pi to listen for a viewer at a given address). Can I do this with TightVNC for the Pi (I can do this with the Windows version of TightVNC) or do I need RealVNC ?
by tdenson
Sun Mar 15, 2015 7:13 pm
Forum: General discussion
Topic: How do I tell if I am running a Pi 2
Replies: 13
Views: 6930

Re: How do I tell if I am running a Pi 2

cat /proc/cpuinfo is very different on Pi 2: Pi B+ processor : 0 model name : ARMv6-compatible processor rev 7 (v6l) Features : swp half thumb fastmult vfp edsp java tls CPU implementer : 0x41 CPU architecture: 7 CPU variant : 0x0 CPU part : 0xb76 CPU revision : 7 Hardware : BCM2708 Revision : 0008...
by tdenson
Sat Mar 14, 2015 9:28 pm
Forum: General discussion
Topic: How do I tell if I am running a Pi 2
Replies: 13
Views: 6930

How do I tell if I am running a Pi 2

How do I tell if I am running a Pi 2 ? I have a number running in remote locations that I cannot physically look at.
by tdenson
Thu Feb 12, 2015 4:56 pm
Forum: Troubleshooting
Topic: Problem with micro SD cards
Replies: 7
Views: 1060

Re: Problem with micro SD cards

Shrink the partition on the image. You'll need to have at least one SD card that you *can* successfully write to. Take this successful SD card and use GParted to shrink/resize the partition. If you have a spare Intel-architecture PC, you can run the GParted Live CD to resize it. http://gparted.sour...
by tdenson
Thu Feb 12, 2015 10:53 am
Forum: Troubleshooting
Topic: Problem with micro SD cards
Replies: 7
Views: 1060

Re: Problem with micro SD cards

Yes, you can tell dd to stop short by using the "count=nnnn" option, but when it gives the error it will have written all it can to the card anyway. If you haven't expanded the root filesystem and you aren't using a NOOBS installation, then you should be OK with that as the missing part won't have ...
by tdenson
Thu Feb 12, 2015 10:16 am
Forum: Troubleshooting
Topic: Problem with micro SD cards
Replies: 7
Views: 1060

Re: Problem with micro SD cards

Ah, that appears to be it, there is definitely a difference in size and the ones that fail are smaller. I didn't realise this was the case, I rather assumed that all 16GB cards were the same size !
Is it possible for me just to tell DD to stop short, seeing as it's only a basic RPi image
by tdenson
Thu Feb 12, 2015 9:34 am
Forum: Troubleshooting
Topic: Problem with micro SD cards
Replies: 7
Views: 1060

Problem with micro SD cards

I know this is a bit of an old chestnut, but I'm going potty trying to install Raspbian onto micro SD cards for use in 6 different Pi 2's. I have got 10 Sandisk SDC10/16GB cards (bought from Amazon). I am using DD to restore a working image from my Mac using Terminal. 5 of the cards work and 5 don't...
by tdenson
Wed Feb 11, 2015 1:58 pm
Forum: Troubleshooting
Topic: Hyphen in hostname
Replies: 3
Views: 802

Re: Hyphen in hostname

When I change my hostname to include a hyphen (which I understood was a valid character in a hostname) I get "sudo: unable to resolve host myhost-test" whenever I use a sudo command. Is this correct ? Have a look at these: /ect/hostname /etc/hosts Both the hostname in /ect/hostname and the hostname...
by tdenson
Tue Feb 10, 2015 1:55 pm
Forum: Troubleshooting
Topic: Hyphen in hostname
Replies: 3
Views: 802

Hyphen in hostname

When I change my hostname to include a hyphen (which I understood was a valid character in a hostname) I get "sudo: unable to resolve host myhost-test" whenever I use a sudo command. Is this correct ?
by tdenson
Mon Jan 26, 2015 10:40 pm
Forum: Beginners
Topic: Running a script automatically
Replies: 24
Views: 2095

Re: Running a script automatically

I wonder if someone can help me here. When I run my script manually it works fine, but as soon as I run it via cron it fails - instead of sending emails to my email address they get sent to [email protected] I suspect it's to do with environment variables but not sure.
by tdenson
Sat Jan 24, 2015 2:07 pm
Forum: Beginners
Topic: Running a script automatically
Replies: 24
Views: 2095

Re: Running a script automatically

Looking at this again from a newbie's point of view, it seems to me that one big advantage of the cron approach (versus something that is run once and handles it's own timings) is that an error in logic that causes the script to occasionally terminate will not matter so much as the script will be re...
by tdenson
Fri Jan 23, 2015 4:29 pm
Forum: Beginners
Topic: Running a script automatically
Replies: 24
Views: 2095

Re: Running a script automatically

cron is fine if the system stays up and the clock stays at correct time for 24h/day - which is not the case if the system boots up randomly and has a weak WiFi connection. anacron might be better in such a case. The system time might jump quite a lot when the network connection is finally establish...
by tdenson
Fri Jan 23, 2015 1:00 pm
Forum: Beginners
Topic: Running a script automatically
Replies: 24
Views: 2095

Re: Running a script automatically

I take your point, but as a relative newbie to the Pi (it is 30 years since I last did anything serious with Unix) I would like to keep it simple. I looked at what's required to start up a script automatically on a reboot and it looked a bit complicated. It is not http://blog.scphillips.com/2013/07...
by tdenson
Fri Jan 23, 2015 12:26 pm
Forum: Beginners
Topic: Running a script automatically
Replies: 24
Views: 2095

Re: Running a script automatically

why a so closed answer? for example, i like more "daemonizing" my scripts, so i can check if they are still up anytime i want with a sudo service myservice status Why cron should be better? A service allows you, for example, also to manage "unexpected" events. If something happens in the 10 minute ...
by tdenson
Fri Jan 23, 2015 11:45 am
Forum: Beginners
Topic: Running a script automatically
Replies: 24
Views: 2095

Running a script automatically

I have a shell script which acts as a sort of watchdog timer. It's running on a remote machine and sends me a file every ten minutes as confirmation that it's still running. It also alerts me to a change of external ip address. I have two choices with this - 1. Run it via cron 2. Embed in the script...
by tdenson
Wed Jan 21, 2015 10:07 pm
Forum: Beginners
Topic: Using cron
Replies: 3
Views: 521

Re: Using cron

Thanks, now I understand it
by tdenson
Wed Jan 21, 2015 8:47 pm
Forum: Beginners
Topic: Using cron
Replies: 3
Views: 521

Using cron

I have been experimenting with cron and I can get it to work by creating an entry using "crontab -e". However, what confuses me is that this creates a crontab file in a directory of /tmp. But I thought the tmp directory got cleared out on a reboot .

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