1. filename: Name of the file to receive the output of the tracing operation.
   

   Enclose the name within quotation marks. All files are placed in the directory /var/log. By default, the name of the file is the name of the process being traced.
   

2. files number: Maximum number of trace files.
   

   When a trace file named trace-file reaches its maximum size, it is renamed to trace-file.0, then trace-file.1, and so on, until the maximum number of trace files is reached. The oldest archived file is overwritten.
   If you specify a maximum number of files, you also must specify a maximum file size with the size option and a filename.
   Range: 2 through 1000 files
   Default: 3 files
   

3. match regular-expression: Refine the output to include lines that contain the regular expression.
4. size maximum-file-size: Maximum size of each trace file, in kilobytes (KB), megabytes (MB), or gigabytes (GB).
   

   When a trace file named trace-file reaches this size, it is renamed trace-file.0.
   When the trace-file again reaches its maximum size, trace-file.0 is renamed trace-file.1 and trace-file is renamed trace-file.0. This renaming scheme continues until the maximum number of trace files is reached. Then the oldest trace file is overwritten.
   If you specify a maximum file size, you also must specify a maximum number of trace files with the files option and a filename.
   Syntax: x K to specify KB, x m to specify MB, or x g to specify GB
   Range: 10 KB through 1 GB
   Default: 128 KB
   world-readable | no-world-readable: By default, log files can be accessed only by the user who configures the tracing operation. The world-readable option enables any user to read the file. To explicitly set the default behavior, use the no-world-readable option.

all: Trace with all flags enabled

error: Match error conditions
info: Match informational messages
notice: Match conditions that should be handled specially
Verbose: Match verbose messages
warning: Match warning messages