and inside one:

debian@beaglebone:/sys/class/gpio/gpio2$ ls -lha
total 0
drwxrwxr-x  3 root gpio    0 Apr 27 21:38 .
drwxrwxr-x 16 root gpio    0 Apr 27 21:38 ..
-rw-rw-r--  1 root gpio 4.0K Apr 27 21:38 active_low
lrwxrwxrwx  1 root gpio    0 Apr 27 21:38 device -> ../../../gpiochip0
-rw-rw-r--  1 root gpio 4.0K Apr 27 21:38 direction
-rw-rw-r--  1 root gpio 4.0K Apr 27 21:38 edge
-rw-rw-r--  1 root gpio 4.0K Apr 27 21:38 label
drwxrwxr-x  2 root gpio    0 Apr 27 21:38 power
lrwxrwxrwx  1 root gpio    0 Apr 27 21:38 subsystem ->
../../../../../../../class/gpio
-rw-rw-r--  1 root gpio 4.0K Apr 27 21:38 uevent
-rw-rw-r--  1 root gpio 4.0K Apr 27 21:38 value

Regards,

-- 
Robert Nelson
https://rcn-ee.com/

-- 
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