I don't think that "uniq -u" does what is needed here.This might be
closer to what you're looking for:
perl -ni -e 'print if !$seen{$_}++' /etc/fstab
but that would also remove repeated comment lines which may be desired
in some cases. Best to just not add duplicates in the first place.
--
cloud-init cloud-config-mounts can add duplicate fstab entries
https://bugs.launchpad.net/bugs/524562
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