Several months ago I posted a note asking how to prevent the Cloud9 IDE
running its shell as root. The answer pointed out where the bash command
is launched.
if (options.terminal) {
args.push("export ISOUTPUTPANE=0;"
+ (options.defaultEditor
? " export EDITOR='`which c9` open --wait'; "
: "")
+ BASH + " -l");
}
> Terminals in cloud9 run bash -l so they will be logged in as the same user
> which have launched the server.js.
>
> See
> https://github.com/c9/core/blob/6cc153e712c64ef8326c195d27a2c224f84429c6/node_modules/vfs-local/localfs.js#L1817
>
> You could either modify that file to run a different command, or modify
> the script that launches the server.js, to launch it from the user you want.
>
>
> --
> Harutyun Amirjanyan <commun...@c9.io>
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On Fri, Feb 5, 2016 at 7:10 PM, William Hermans <yyrk...@gmail.com> wrote:
> I "get it" though. Like for me, I know very basic electronics "OK", but
> really do not have the time nor inclination to become a fully fledged E.E.
> Or my buddy here, who is an excellent E.E. but whom also does not want to
> learn how to program.
>
> I will say that the only real differences I can think of between GPIO, and
> PWM in any code should only be file path, and values sent to the file
> handle. So anyone willing to read through,and understand the code for
> GPIO. Should theoretically be able to adapt that code for PWM as well.
>
> Unfortunately, in my own case. If I do not have the time to bother
> learning this "something". Obviously I do not have the time to refactor the
> existing code either . . .
>
>
>
> On Fri, Feb 5, 2016 at 4:15 PM, Wally Bkg <wb666gre...@gmail.com> wrote:
>
>>
>>
>> On Friday, February 5, 2016 at 1:48:53 PM UTC-6, William Hermans wrote:
>>>
>>> *After giving him a configured BBG (he'd have been dead in the water
>>>> with the image that came in the BBG eMMC, which really breaks the ideal for
>>>> a newbie idea) and showing him how to install the Windows drivers and
>>>> connect to the BBG with Chrome web browser, it clearly was a great starting
>>>> point for him.*
>>>>
>>>
>>> Anything of this nature still has a learning curve. Personally, I think
>>> things of this nature are a waste of time. Not because they're not handy,
>>> or cool. But instead you have to spend a time investment to learn anything.
>>> So you may as well learn the "underlying basics" so you're better prepared
>>> in the future to deal with more complex problems.
>>>
>>> So a very quick example . . . Not knowing what Node-RED really is, I'd
>>> have to spend a considerable amount of time learning this new "software
>>> technology", when I could instead just write my own code and be done with
>>> it. Now sure, because I'm an experienced developer, who *now* has a decent
>>> bit of javascript / Nodejs experience, this may be easier for me. However,
>>> I had to learn all of this, just like anyone else, and in fact I'm by far
>>> not a Nodejs "expert". And in fact, I knew very little of Nodejs 3 years
>>> ago when we got our first BBB's . . .
>>>
>>>
>> What you say is true, but I'm afraid its been so long since you've
>> started with zero programming knowledge that you've forgotten how difficult
>> that first step is, its mind numbingly complex when you throw in all the
>> GPIO mux options and restrictions of the Beaglebone
>>
>> A GUI tool like node-red lets a rank beginner do something useful,
>> without spending weeks learning programming and languages. Drag and drop,
>> wire, and deploy can result it a rather sophisticated program with
>> distributed processing -- a sensor in one building communicating with a
>> actuator in another building over a WiFi network using mqtt protocol and
>> mosquito broker running on one of the Beaglebones -- all done like drawing
>> a schematic diagram -- something people with a hardware background find
>> "intuitive". To use a GPIO as input or output, you drag the node to the
>> "tab", double click it, and fill in the necessary "properties" to make the
>> function. The choices are limited to what is available with the "default"
>> pin mux settings but for a beginner its feature, not a bug. If only the
>> PWM worked, and there were UART nodes it could do most anything that needs
>> response times on the order of human reaction times or longer.
>>
>> What's nice is that starting with node-red lets my friend ease into
>> programming with some cut and paste of nodejs examples and modifying them
>> in a "function" node within an otherwise working "flow" (program) to add
>> functionality, instead of starting with a blank page and a "Programming
>> Language Du-jour for Dummies" book in hand.
>>
>> Node-red has some rough edges but it has tremendous potential for helping
>> "subject matter experts" quickly get into programming prototype solutions
>> to their problems. I've always said that its far easier to teach a
>> Biochemist enough programming to solve a biochemistry problem than is is to
>> teach a programmer enough biochemistry to solve a biochemistry problem.
>> Things like node-red really lower the bar!
>>
>>
>> Go to the node-red website and look at the "your second flow" example --
>> it "polls" the UK power grid at 5 minute intervals and reports true or
>> false if the frequency is 50 Hz or greater (below 50 hz, maybe delay
>> starting that induction motor a bit to let the grid recover -- minimal
>> impact from my one motor, but if millions of motors are making this
>> decision before starting, the effect on peak load could be enormous with
>> near zero impact to the refrigerators, etc. driven by these motors). Now
>> list all the libraries and protocols you'd have to know about to be able do
>> this in your favorite programming language, and tell me this is not a
>> better starting point for an appliance manufacturing looking to make a
>> "smart" product.
>>
>> When I stumbled on to this, it just blew me away!
>>
>> --
>> For more options, visit http://beagleboard.org/discuss
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>
> --
> For more options, visit http://beagleboard.org/discuss
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