IO pin control from the command line

Elevate your permissions to root user to allow IO access

sudo -i

Setup to control pin as output

Substitute 23 in the following commands for your GPIO number (GPIO, not pin number)

echo "23" > /sys/class/gpio/export

echo "out" > /sys/class/gpio/gpio23/direction

Control Output State

echo "1" > /sys/class/gpio/gpio23/value

echo "0" > /sys/class/gpio/gpio23/value

Setup to read pin as an input

Substitute 23 in the following commands for your GPIO number (GPIO, not pin number)

echo "23" > /sys/class/gpio/export

echo "in" > /sys/class/gpio/gpio23/direction

Read its state

cat /sys/class/gpio/gpio23/value

To Release A Pin Afterwards

echo "23" > /sys/class/gpio/unexport