#!/bin/sh
prog=`basename $0`
[ "$2" ] || { cat >&2 <<EOS
  Usage:    $prog [minutes] command
  Example:  $prog 30 update foo   #run update foo every thirty minutes
EOS
exit 1
}

delay=$1
shift
while :; do
  echo "`date` -- $@"
  "$@"
  echo "...sleeping $delay minutes..."
  sleep ${delay}m
done