Logging enhancers are tools that simplify logging by allowing logging information to be filtered and often displaying logs in simplified formats. Many open source logging programs exist to make system administration much easier. Viewing text-based files with hundreds or thousands of entries can be burdensome, especially if you are only looking for one specific error entry. Logging enhancers can make logging a much more user-friendly experience, and greatly expand and customize the information you need to log.
The next sections explain three popular logging services used by administrators: SWATCH, scanlogd, and the next generation of syslogd (syslogd-ng).
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