Though the documentation explains all the actions available for check_postgres, it may be inconvenient to refer to it regularly. Though the check_postgres.pl script accepts the usual --help parameter, it has a notable ability as well. If we specify the --man parameter instead, check_postgres will actually display the entire manual. This is similar to investigating the check_postgres man page like this:
man check_postgres
Sometimes, man pages don't get installed properly or are not available for one reason or another. The --man parameter should always work on any system that also contains the perl documentation package.
