Red Hat ENTERPRISE LINUX 4 System Administration Manual page 256

Chapter 24. Apache HTTP Server Configuration
Figure 24.4. Logging
You can configure a custom log format by checking Use custom logging facilities and entering a
custom log string in the Custom Log String field. This configures the
http://httpd.apache.org/docs-2.0/mod/mod_log_config.html#formats
directive.
The error log contains a list of any server errors that occur. Enter the name of the path and file in
which to store this information. If the path and file name do not start with a slash (/), the path is relative
to the server root directory as configured. This option corresponds to the
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http://httpd.apache.org/docs-2.0/mod/mod_log_config.html#logformat
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http://httpd.apache.org/docs-2.0/mod/mod_log_config.html#formats
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http://httpd.apache.org/docs-2.0/mod/core.html#errorlog
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directive. Refer to
LogFormat
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for details on the format of this
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directive.
ErrorLog