Twister

twister.sh

#!/bin/bash

EXPECTED_ARGS=1
E_BADARGS=65
CMDS="say espeak"
exists=false

if [ $# -ne $EXPECTED_ARGS ]
then
    echo "Usage: `basename $0` <seconds>"
    exit $E_BADARGS
fi

for i in $CMDS
do
    type -P $i &>/dev/null && { exists=true; speak=$i; }
done

if ! $exists
then
    echo "No text to speach command found"
    exit 1
fi

while true
do

    case $[ $RANDOM % 4 ] in
    0) $speak "right foot"
       ;;
    1) $speak "left foot"
       ;;
    2) $speak "right hand"
       ;;
    3) $speak "left foot"
       ;;
    esac

    case $[ $RANDOM % 4 ] in
    0) $speak "red"
       ;;
    1) $speak "yellow"
       ;;
    2) $speak "green"
       ;;
    3) $speak "blue"
       ;;
    esac

    sleep $1

done