How do I read a value from a system path?

[GollyJer]

I want to get the value (1 or 0) from this path.

Code: Select all

/sys/devices/virtual/graphics/fb0/hbm

I've messed around with Execute Root but am not getting it right.

Thanks!

[Martin]

Hi,

You could probably use action Execute Root Command with command cat /sys/devices/virtual/graphics/fb0/hbm and then check the contents of variable stdout.
The result likely contains the value and a newline so following script in condition Expression could be used to check if the output is 0: trim(stdout)=="0"

Regards,
Martin

[GollyJer]

That worked perfectly. Thanks!

[john.lasdas]

Thank you GollyJer and Martin,

This solved the half of my problem too.

The other half problem is how I can modify the value of a path like this... (e.g. from Y to N)

Thanks

[GollyJer]

Hi John. Try this

Code: Select all

echo {your_desired_value} > /sys/devices/virtual/graphics/fb0/hbm

[john.lasdas]

Hi John. Try this

Code: Select all

echo {your_desired_value} > /sys/devices/virtual/graphics/fb0/hbm

Thank you GollyJer,

Tried it with execute root command and it worked!