%mel: partioImport -h;

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partioImport -p/particle <particleShapeName> [Options] </full/path/to/particleCacheFile>

[Options]
-p/particle <particleShapeName> (if none defined, one will be created) -atr/attribute (multi use) <cache Attr Name> <PP attribute name>
(position/velocity/id) are always imported

Example:

%mel: partioImport -p particleShape1 -atr "pointColor" "rgbPP" -atr "opacity" "opacityPP" "/file/path/to/fooBar.0001.prt";