sysklogd compatibility

This is a part of the rsyslog.conf documentation.

Rsyslog supports standard sysklogd's configuration file format and extends it. So in general, you can take a "normal" syslog.conf and use it together with rsyslogd. It will understand everything. However, to use most of rsyslogd's unique features, you need to add extended configuration directives.

Rsyslogd supports the classical, selector-based rule lines. They are still at the heart of it and all actions are initiated via rule lines. However, there are ample new directives, either in rsyslog traditional format (starting with a dollar sign) or in RainerScript format. These work together with sysklogd statements. A few select statements are no longer supported and may generate error messages. They are mentioned in the compatibility notes.

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