3.6 Location of configuration files and parsing order

The configuration files are parsed in the following order:

1. compiled-in defaults
2. /etc/mtools.conf
3. ~/.mtoolsrc.
4. $MTOOLSRC (file pointed by the MTOOLSRC environmental variable)

Options described in the later files override those described in the earlier files. Drives defined in earlier files persist if they are not overridden in the later files. For instance, drives A and B may be defined in /etc/mtools.conf and drives C and D may be defined in ~/.mtoolsrc However, if ~/.mtoolsrc also defines drive A, this new description would override the description of drive A in /etc/mtools.conf instead of adding to it. If you want to add a new description to a drive already described in an earlier file, you need to use either the +drive or drive+ keyword.