Problem: need a blink command

Solution: add zoobab's shell script

Author: hintjens

commands/blink

@@ -0,0 +1,35 @@
+#! /bin/sh
+#  Blink a LED 
+# 
+#  blink [times] [sleep]
+#
+GPNR="1"
+TIMES=$1
+SLEEP=$2
+test -z $TIMES && TIMES=1
+test -z $SLEEP && SLEEP=0.2
+
+GPPATH="/sys/class/gpio"
+GPIODIR="${GPPATH}/gpio${GPNR}"
+
+# export the GPIO pin
+if [ -d "${GPIODIR}" ]; then
+    echo "${GPIODIR} found"
+else
+    echo "${GPIODIR} not found, creating it"
+    echo ${GPNR} > ${GPPATH}/export
+fi
+
+echo "Initalize the GPIO direction"
+echo out > ${GPIODIR}/direction
+
+echo "Blinking loop..."
+COUNTER=0
+while [ $COUNTER -lt $TIMES ]; do
+    echo 1 > ${GPIODIR}/value
+    sleep $SLEEP
+    echo 0 > ${GPIODIR}/value
+    sleep $SLEEP
+    COUNTER=`expr $COUNTER + 1`
+done
+