On Sun, 13 Jun 2021 at 06:51, Patrick Dupre <pdu...@gmx.com> wrote: > Hello, > > I wish to remove lines which appear twice in a file, actually > only when they appear more than one time. > How can I do so? >
Do you need to keep the lines in the same order? If not, then "sort -u" should work. You may also want to use "uniq". % cat nonuniq.txt dd aa bb cc bb aa % sort -u nonuniq.txt aa bb cc dd -- George N. White III
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