wait N seconds

wait_seconds.sh

function wait_seconds()
{
    func_name="wait_seconds"
    if ! expr "$1" : '[0-9]*' > /dev/null ; 
    then
	echo "${func_name} ERROR: argument is not number"
	return
    fi
    for i in `seq $1`; do
	echo "wait for `expr $1 + 1 - ${i}` seconds..."
	sleep 1
    done
}