Some administration commands
cat /var/log/secure (as root) Inspect the important system log. It is really a good idea to do it from time to time if you use Internet access. watch -n 60 my_command Execute my_command repeatedly at 60-second intervals (the default interval is 2 seconds). more u can access. http://linux.about.com/od/linux101/l/blnewbie5_12.htm