Thanks for the response...

I did manage to sort the issue by performing two steps: 

a. Added a udev rule to make gpio accessible
b. Added user to gpio group...

Hemant Kapoor

On Monday, 5 February 2018 19:46:12 UTC, Jeff Andich wrote:
> Switching to root before doing sysfs operations, (e.g. sudo su), typically 
> seems to work for me..
> On Friday, February 2, 2018 at 12:01:43 PM UTC-6, Hemant Kapoor wrote:
>> Hello, 
>> Yet another newbie question. 
>> I have got latest debian image on my beagle bone black.
>> uname - r output: 4.9.45-ti-r57
>> and I noticed various gpio directory in /sys/class/gpio
>> when I tried
>> echo 69 > unexport 
>> it gave me permission denied.
>> so I changed the permission of unexport file to be 666
>> and now when I try to use the same command it gives me an error: 
>> -bash: echo: write error: Invalid argument
>> Can anyone please help...
>> Ultimately I want to develop a C++ project to toggle LED which is 
>> connected to one of the pins...
>> Any help regarding this matter is deeply appreciated.
>> Regards, 
>> Hemant Kapoor

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