/usr/share/freemat/help/text/rehash.mdc is in freemat-help 4.0-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | REHASH REHASH Rehash Directory Caches
Usage
Usually, FreeMat will automatically determine when M Files have
changed, and pick up changes you have made to M files. Sometimes,
you have to force a refresh. Use the rehash command for this
purpose. The syntax for its use is
rehash
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