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by pidd
Fri Jun 18, 2021 2:23 am
Forum: General discussion
Topic: Need info on SSH Keys
Replies: 12
Views: 275

Re: Need info on SSH Keys

My humblest apologies, I did get it back to front - I even thought I had double checked where my keys were (because I got it back-to-front once before) :oops:
by pidd
Fri Jun 18, 2021 2:13 am
Forum: Off topic discussion
Topic: Coming to RPiOS...soon?
Replies: 16
Views: 603

Re: Coming to RPiOS...soon?

Just read in another post, RPi5 details almost sorted out - wonder how long the process will be from details to hardware....I'm guessing somewhere in about 2 years - hope I can still afford one... :mrgreen: (No, I'm not even going to guess what it will be...... :D ) As its designed to a price even ...
by pidd
Fri Jun 18, 2021 1:42 am
Forum: General discussion
Topic: Need info on SSH Keys
Replies: 12
Views: 275

Re: Need info on SSH Keys

Yes, create the key on your computer (with correct user - usually root for backups) then transfer it to the Pi root user I normally copy and paste it into /root/.ssh/authorized_keys. Test it by logging into the pi then sudo ssh mycomputer You might have to confirm the host if it is the first time r...
by pidd
Fri Jun 18, 2021 1:34 am
Forum: Troubleshooting
Topic: A big difference in temperature between Debian versions
Replies: 3
Views: 103

Re: A big difference in temperature between Debian versions

Unfortunately those heatsinks are a poor design, the fins are far too close together and choke the thermo-siphoning, it is not all about surface area. But as you say, your experiment appears to show the software version appears to make an impact. It would be interesting to see temperature figures if...
by pidd
Fri Jun 18, 2021 1:18 am
Forum: General discussion
Topic: Need info on SSH Keys
Replies: 12
Views: 275

Re: Need info on SSH Keys

Yes, create the key on your computer (with correct user - usually root for backups) then transfer it to the Pi root user I'm pretty sure that the user information isn't stored in the key. I've moved keys created by one user to another with no problem. That said, the keys need to be configured corre...
by pidd
Fri Jun 18, 2021 12:50 am
Forum: General discussion
Topic: Need info on SSH Keys
Replies: 12
Views: 275

Re: Need info on SSH Keys

Yes, create the key on your computer (with correct user - usually root for backups) then transfer it to the Pi root user I normally copy and paste it into /root/.ssh/authorized_keys. Test it by logging into the pi then sudo ssh mycomputer You might have to confirm the host if it is the first time ro...
by pidd
Thu Jun 17, 2021 7:34 pm
Forum: General discussion
Topic: Need info on SSH Keys
Replies: 12
Views: 275

Re: Need info on SSH Keys

SSH key in one direction won't mess the other up, it only affects the "in" direction because the user has been given the key to allow it in. Rsync can pull or push, the argument about which is the best way has gone on for years. Although I prefer to push I've ended up mostly pulling as tha...
by pidd
Thu Jun 17, 2021 7:21 pm
Forum: Raspberry Pi OS
Topic: Cannot mount EXT4 18TB USB3.0 HDD Error: filesystem too large to mount safely on this system
Replies: 1
Views: 89

Re: Cannot mount EXT4 18TB USB3.0 HDD Error: filesystem too large to mount safely on this system

From elsewhere ....
32 bit kernels are limited to 16 TiB because the page cache entry index is only 32 bits.
by pidd
Thu Jun 17, 2021 5:11 pm
Forum: Off topic discussion
Topic: "Right to Repair Legislation and the Raspberry Pi"
Replies: 147
Views: 5061

Re: "Right to Repair Legislation and the Raspberry Pi"

Will a system (CPU + memory + storage device) ever start repeating itself in some endlessly recurring sequence? By itself it has to. Yes, you are right, while it is possible to produce "disproportionately" large sequences compared to the available resources, it will eventually run out of ...
by pidd
Thu Jun 17, 2021 3:08 pm
Forum: C/C++
Topic: Outline of Using Waveshare C/C++ Libraries
Replies: 2
Views: 290

Re: Outline of Using Waveshare C/C++ Libraries

Thanks, I forgot I had posted that. I got it all sorted in the end, my biggest battle was CmakeLists which I virtually bypassed by including everything globally in the main program instead of using CMakeLists to do it - probably very bad practice but it works. Once I broke down the waveshare librari...
by pidd
Thu Jun 17, 2021 3:49 am
Forum: Beginners
Topic: Raspberry Pi root password?
Replies: 9
Views: 407

Re: Raspberry Pi root password?

I thought root is passwordless by default, though it might not have been some time ago.
by pidd
Thu Jun 17, 2021 3:31 am
Forum: Off topic discussion
Topic: "Right to Repair Legislation and the Raspberry Pi"
Replies: 147
Views: 5061

Re: "Right to Repair Legislation and the Raspberry Pi"

An SSD is good for long-term archiving, additionally if powered they should autonomously check the data every so-often to correct any data fades whilst errors are still correctable and so last even longer. Prof Simon is stating a fact but not stating any quantities or timescales. SSD's only problem ...
by pidd
Thu Jun 17, 2021 2:47 am
Forum: General
Topic: Raspberry Pi Pico and pico-LCD-1.14 board
Replies: 3
Views: 156

Re: Raspberry Pi Pico and pico-LCD-1.14 board

What do you want it to do? Pico-LCD-1.14.py shows you how to initialise SPI, initialise the display, setup a framebuffer, clear screen, change colours, print text, print lines, print rectangles to the framebuffer then display the framebuffer. It also shows you how to read the buttons. Basically you ...
by pidd
Thu Jun 17, 2021 1:01 am
Forum: Off topic discussion
Topic: "Right to Repair Legislation and the Raspberry Pi"
Replies: 147
Views: 5061

Re: "Right to Repair Legislation and the Raspberry Pi"

So can a ROM contain software or is it really a logic circuit? We even have logic languages, so is logic software or hardware etc etc. The term software is just an abstraction used as the description of parts of the design process but as I originally hypothesised, at the end user level it is just ha...
by pidd
Wed Jun 16, 2021 3:30 pm
Forum: General discussion
Topic: Sync Raspberry pi folder to SFTP server
Replies: 5
Views: 237

Re: Sync Raspberry pi folder to SFTP server

Perhaps use lftp's "-c" instead of "-f" because you are using a command list.
by pidd
Wed Jun 16, 2021 12:36 pm
Forum: Off topic discussion
Topic: "Right to Repair Legislation and the Raspberry Pi"
Replies: 147
Views: 5061

Re: "Right to Repair Legislation and the Raspberry Pi"

The right to correct the law will make life very easy for many people. The right to fix code, including algorithms that make decisions that have no redress under law? Fix the software as well as the hardware ;) I've often wondered how they define the difference between hardware and software, both a...
by pidd
Tue Jun 15, 2021 12:05 pm
Forum: Beginners
Topic: Can the RPi consumes more than 3 A?
Replies: 10
Views: 319

Re: Can the RPi consumes more than 3 A?

Supply fuses are to protect supply cables/wires, they can't protect a device that has already gone faulty. It is no use using a 4 Amp fuse if your cable/wire is only rated at 3 Amp, the fuse must be rated at less than the cable/wire. Device protection fuses (instrument/equipment fuses) are either su...
by pidd
Mon Jun 14, 2021 7:59 pm
Forum: C/C++
Topic: Schrödinger's Code - Undefined behavior in theory and practice
Replies: 85
Views: 2948

Re: Schrödinger's Code - Undefined behavior in theory and practice

Thanks @Paeryn, I've never looked at Haskell at all, I will have a peek out of curiosity.
by pidd
Mon Jun 14, 2021 4:26 pm
Forum: Automation, sensing and robotics
Topic: how to strip REALLY thin wires?
Replies: 12
Views: 517

Re: how to strip REALLY thin wires?

If its a polyurethane enamel then it is solder-through, no need to strip. This is the same as Verowire/Vero-pens.
by pidd
Mon Jun 14, 2021 3:08 pm
Forum: General discussion
Topic: How viable is RPI 4B as a home PC?
Replies: 18
Views: 810

Re: How viable is RPI 4B as a home PC?

just make sure you read up on the limitations like no drm, etc.... Thanks for mentioning that, I forgot about this, and it actually might be a problem. Which really sucks because it seems perfect otherwise Not my thing but https://pimylifeup.com/raspberry-pi-widevine/ looks promising for drm.
by pidd
Mon Jun 14, 2021 1:00 pm
Forum: C/C++
Topic: Schrödinger's Code - Undefined behavior in theory and practice
Replies: 85
Views: 2948

Re: Schrödinger's Code - Undefined behavior in theory and practice

Is there a general programming language that retains or can retain numbers as general fractions as opposed to fractions of the base? It wouldn't be that difficult to implement, simplification (factorisation) of the fractions would not be needed internally so speedwise it would not be a great impact ...
by pidd
Mon Jun 14, 2021 3:07 am
Forum: General discussion
Topic: How viable is RPI 4B as a home PC?
Replies: 18
Views: 810

Re: How viable is RPI 4B as a home PC?

I use a Pi4 4GB with an SSD as my main desktop computer. The only negative I have at the moment is the current version of Chromium (browser) is not as good as the previous version, some users have gone back to the previous version but the next version of Chromium is probably due soon. There are othe...
by pidd
Mon Jun 14, 2021 2:39 am
Forum: Advanced users
Topic: startx at boot single client and unprivileged user
Replies: 23
Views: 591

Re: startx at boot single client and unprivileged user

swampdog wrote:
Mon Jun 14, 2021 12:09 am
If I have an rpi autoboot into GUI "foo" it is still referencing "/etc/xdg/lxsession/LXDE-pi/autostart" so there's something to be investigated there.
That is ok, LXDE-pi is referring to the Raspberry Pi computer, not the user Pi.
by pidd
Mon Jun 14, 2021 2:35 am
Forum: General discussion
Topic: Setup for database
Replies: 5
Views: 264

Re: Setup for database

automysqlbackup is in the repository which provides daily, weekly, monthly or whatever combination of backups you want really easily.
by pidd
Sat Jun 12, 2021 12:03 am
Forum: General discussion
Topic: ssd disk
Replies: 20
Views: 771

Re: ssd disk

Yes, you are right, The ssd ´s speed i mentioned is indeed in MB (megabytes) instead of Mbits. So this should be okay then. I saw there are actually very fast ssd´s wich reach a much higher speed then the Pi 4´s maximum. So buying those just for the the Pi4 would be of no use then. The faster SSDs ...

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