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Re:Ask HN: What is something you do for clients that consist... by thibaut_barrere on Monday December 12, 2016 @10:00AM (#13158457)
One useful trick is that you can rely on the headless version of LibreOffice to do the conversion, here on Mac for instance (but also work on Ubuntu with a slightly different call):

    /Applications/LibreOffice.app/Contents/MacOS/soffice --headless --convert-to xlsx file.csv
Note, though, that some conversion errors can still occur (I've seen one personally a long time back).
Re:Ask HN: What is something you do for clients that consist... by Piskvorrr on Monday December 12, 2016 @11:36AM (#13159353)
This works for many other formats, too: anything to PDF, for example.

A resource hog, though - had to close it off into its own container, lest it gobble up all available RAM.