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How can I make vasp to output Cartesian coordinates, rather than direct, in the contcar file?

You will need to rewrite the write-function for the CONTCAR file.

For which purpose do you need this? If you should do some post-processing, just write a small script that reads and then multiplies matrix for the basis vectors with the matrix for the direct coordinates.

Cheers,
/Dan

an alternative would be to read (grep) the positions in cartesian coordinates from OUTCAR. If you want to continue your run
from a modified CONTCAR, simply plug the data into CONTCAR accordingly