Watcher
$ crontab -u root -e
* 6-15 * * 1-5 /usr/local/watcher.sh
0-30 15 * * 1-5 /usr/local/watcher.sh
30-59 17 * * 1-5 /usr/local/watcher.sh
* 18-23 * * 1-5 /usr/local/watcher.sh
$ crontab -u root -e
* 6-15 * * 1-5 /usr/local/watcher.sh
0-30 15 * * 1-5 /usr/local/watcher.sh
30-59 17 * * 1-5 /usr/local/watcher.sh
* 18-23 * * 1-5 /usr/local/watcher.sh