Common command-line options

A number of command-line MAT applications make these common options available:

--version
Print version number and exit.
--debug
Enable debug output.
--subprocess_debug <i>
Set the subprocess debug level to the value provided, overriding the global setting. 0 disables, 1 shows some subprocess activity, 2 shows all subprocess activity.
--subprocess_statistics
Enable subprocess statistics (memory/time), if the capability is available and it isn't globally enabled.
--tmpdir_root <d>
Override the default system location for temporary files. If the directory doesn't exist, it will be created. Use this feature to control where temporary files are created, for added security, or in conjunction with --preserve_tempfiles, as a debugging aid.
--preserve_tempfiles
Preserve the temporary files created, as a debugging aid.
--verbose_config
If specified, print to stderr the source of each MAT configuration variable the first time it's accessed.