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Old 08-18-2014, 02:11 PM   #1
neha2d
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Registered: Jun 2014
Posts: 2

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Use of System() function to execute shell command " Echo "


Hello,


I want to execute following command using system() function to write value "1" as string in a file.

The command that I am passing to system() as a string is:-

"echo 1 > /sys/class/gpio/goio14/value".

I want to write value 1 in the file "/sys/class/gpio/goio14/value". Also want to use system function() to execute the command.

When I am executing system() command, I am not getting any error but if I open the file and check for the file,file contains the older value that is 0 and new value is not getting written in the file.


I am not able to figure what the problem is. When program execution comes to the point of system() function

I am getting following message:
sh: can't create /sys/class/gpio/goio14/value: nonexistent directory

But the file "value" is already present at the mentioned path.

Any help regarding the same would be appreciated.
Thank You in advance.
 
Old 08-18-2014, 02:16 PM   #2
ntubski
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Registered: Nov 2005
Distribution: Debian, Arch
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Quote:
Originally Posted by neha2d View Post
"echo 1 > /sys/class/gpio/goio14/value".
Typo? Shouldn't that be gpio14?
 
  


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