A script to get the details of an exported GPIO device.

gpiodetails.sh

#! /bin/bash -e

if [[ $# < 2 ]]; then
    echo "Example usage: $0 1 27"
    echo "This would get the details of GPIO1_27 if it's exported."
    exit 1
fi

DEVNUM=$(( 32 * $1 + $2 ))

if [ ! -d "/sys/class/gpio/gpio$DEVNUM" ]; then
    echo "Could not find GPIO$1_$2! Make sure it was exported!"
    exit 1
fi

echo "# Device found: gpio$DEVNUM"

for file in /sys/class/gpio/gpio$DEVNUM/*; do
    if [ -f "$file" ]; then
        echo -n "- ${file//"/sys/class/gpio/gpio$DEVNUM/"}: "
        CONTENTS="$(cat "$file")"
        if [ -z "$CONTENTS" ]; then
            echo "<EMPTY>"
        else
            echo "$CONTENTS"
        fi
    fi
done