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1.4.1 Switches
The following switches allow the user to control how Regina
executes the supplied Rexx program.  Switches are recognised by a
leading hyphen character; `-, followed immediately by a single
alphabetic character.  Some switches allow for optional
parameters.  These, too must follow the switch  without any
intervening spaces.  All switches and their optional parameters
are case-sensitive.

     -t[trace parameter]Turn on the specified tracing level.  The
                   optional trace parameter indicates the tracing
                   level to be used.  See the TRACE command later
                   in this document for an explanation of each
                   trace level.