#!/bin/sh OUT1=1 OUT2=2 OUT3=3 OUT4=7 OUT5=8 OUT6=9 OUT7=11 OUT8=12 for n in $(seq 1 8) ; do eval "echo \$OUT$n > /sys/class/gpio/export" eval "echo out > /sys/class/gpio/gpio\$OUT$n/direction" # 0=on 1=off :) VAL=0 eval "echo $VAL > /sys/class/gpio/gpio\$OUT$n/value" sleep 0.2 done