Cron exercises

Make a cron entry to run system updates every other day at 1am
	As root:
	crontab -e
	Add lines: 
		00 1 */2 * * yum update
		0 */6 * * * uptime >> /var/log/running.log
	
	su profe
	crontab -e
	Add lines:
		0 0,5,10,15,20 * * 0,4,6 who | mail -s "CURRENTLY LOGON USERS" root; ps | mail -s "ACTIVELY RUNNING PROCESSES" root
		30 2,7,12,17,22  * * 0,4,6 who | mail -s "CURRENTLY LOGON USERS" root; ps | mail -s "ACTIVELY RUNNING PROCESSES" root