If you have syslogd(8) or an equivalent installed, you will be able to do logging. There is a large amount of information that can be logged. The log is arranged as a succession of levels. At the lowest level only extremely strange situations are logged. At the highest level, even the most mundane and uninteresting events are recorded for posterity. As a convention, log levels under ten are considered generally useful; log levels above 64 are reserved for debugging purposes. Levels from 11-64 are reserved for verbose information that some sites might want.
A complete description of the log levels is given in section