Because of this I always use `uniq`. POSIX' documentation and Apple's man-page at least are bit better formulated than : -u Unique: suppress all but one i

Because of this I always use `uniq`. POSIX' documentation and Apple's man-page at least are bit better formulated than : -u Unique: suppress all but one in each set of lines having equal keys. [...] -n Restrict the sort key to an initial numeric string, [...] https://pubs.opengroup.org/onlinepubs/9699919799/utilities/sort.html https://pubs.opengroup.org/onlinepubs/9699919799/utilities/s... than the GNU version - looks like the person documenting `-u` hasn't known what it does (never attribute to malice ...): -u, --unique with -c, check for strict ordering; without -c, output only the first of an equal run