How do I search the man page database on redhat?

[africaele]

Also see:
man - an interface to the on-line reference manuals
apropos - search the manual page names and descriptions

$ man -k rsyslog
rsyslog.conf (5)     - rsyslogd(8) configuration file
rsyslogd (8)         - reliable and extended syslogd

or

$  apropos rsyslog
rsyslog.conf (5)     - rsyslogd(8) configuration file
rsyslogd (8)         - reliable and extended syslogd

Wildcards and regular expressions can be used.

$ apropos syslog*
rsyslog.conf (5)     - rsyslogd(8) configuration file
rsyslogd (8)         - reliable and extended syslogd