I'm a semi-linux newcomer and i have a question:

I need to set some GPIO pins in this way: (pin 18 out, pin 17 in) (actually i'm doing this via WiringPi(pyton) trought this commands)

gpio export 18 out

gpio export 17 in

All Works fine if i run these commands via terminal. However i have set these commands in


before exit 0

to run it at boot, but after some tryies it won't work. It could be a path problem? Any help is appreciated, Thanks mboy.

  • Path thing - yes, better fix it to using full path. What happens when you run /etc/rc.local - are you getting any output, is the script runnable? – abolotnov Jan 25 '13 at 20:39
  • Ok, but i'dont know how to set full path.. it's the first time that i use rc.local and wiringpi.. – malgaboy Jan 26 '13 at 10:34

I've fixed it! All i needed is to set full path. In my case /usr/local/bin/gpio export 18 out because gpio is a third party command.

| improve this answer | |

Another good idea is to create your own script like:

#! /bin/bash gpio mode 18 out gpio mode 17 in exit 0

Save it to file e.g. gpio_init.sh

Run chmod a+x simple_bash.sh to make it executable

Copy to init.d with: sudo cp /path_to_script/script.sh /etc/init.d/

Add to boot sequence: sudo update-rc.d script.sh defaults

| improve this answer | |

As an addition for Andrey Volkov's answer, new Debian system has a set format for the init script. Please refers to here

With that I have made a script that should work on your system.

Name the following script gpio_init and chown to root.root and chmod to 755. Copy it to /etc/init.d/

# Provides:          gpio_init
# Required-Start:    $local_fs $network $named $time $syslog
# Required-Stop:     $local_fs $network $named $time $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Description:       Initialize GPIO pins for the project



start() {
  if [ -f /var/run/$PIDNAME ] && kill -0 $(cat /var/run/$PIDNAME); then
    echo 'Service already running' >&2
    return 1
  echo 'Starting service…' >&2
  local CMD="$SCRIPT &> \"$LOGFILE\" & echo \$!"
  su -c "$CMD" $RUNAS > "$PIDFILE"
  echo 'Service started' >&2

stop() {
  if [ ! -f "$PIDFILE" ] || ! kill -0 $(cat "$PIDFILE"); then
    echo 'Service not running' >&2
    return 1
  echo 'Stopping service…' >&2
  kill -15 $(cat "$PIDFILE") && rm -f "$PIDFILE"
  echo 'Service stopped' >&2

uninstall() {
  echo -n "Are you really sure you want to uninstall this service? That cannot be undone. [yes|No] "
  local SURE
  read SURE
  if [ "$SURE" = "yes" ]; then
    rm -f "$PIDFILE"
    echo "Notice: log file is not be removed: '$LOGFILE'" >&2
    update-rc.d -f gpio_init remove
    rm -fv "$0"

case "$1" in
    echo "Usage: $0 {start|stop|restart|uninstall}"

This script will call another script under /usr/local/bin/

gpio-init (sorry about the naming here...

#! /bin/bash

function cleanup {
    echo 5 > /sys/class/gpio/unexport
    echo 6 > /sys/class/gpio/unexport
    exit 0

# Clean up when exit
trap cleanup EXIT
trap cleanup SIGHUP
trap cleanup SIGQUIT
trap cleanup SIGINT
trap cleanup SIGTERM

echo 5 > /sys/class/gpio/export
echo "out" > /sys/class/gpio/gpio5/direction
echo 1 > /sys/class/gpio/gpio5/value
sleep 0.000030  # 30us
echo 0 > /sys/class/gpio/gpio5/value
sleep 0.000030  # 30us
echo 1 > /sys/class/gpio/gpio5/value
sleep 0.001

echo 6 > /sys/class/gpio/export
echo "in" > /sys/class/gpio/gpio6/direction
echo "rising" > /sys/class/gpio/gpio6/edge

sleep infinity

exit 0

A couple of things here. First I use echo GPIO_PIN > /sys/class/gpio/export for exporting the pin, similarly for setting up IN/OUT 1/0 INTERRUPT edge. You can customize it according to your need.

I use sleep infinity to let it run forever

I capture any interrupt signals and do a clean up function where I unexported the GPIO PINS.

Again made this script only writable to root (for security reason) and put it under /usr/loca/bin

Test with sudo /etc/init.d/gpio_init start And sudo /etc/init.d/gpio_init stop

And once ready use sudo update-rc.d gpio-init defaults to run the script at start up

| improve this answer | |
  • 2
    Might work for anyone running an obsolete SysV OS, but hardly relevant. – Milliways Jun 7 '19 at 4:18

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