UNIQ(1) UNIQ(1) uniq - uniq []... [ []] -c, --count -d, --repeated -D -D, --all-repeated[=METHOD] -DMETHOD={none(default),prepend,separate} -f, --skip-fields=N N --group[=METHOD] METHOD={separate(default), prepend, append, both} -i, --ignore-case -s, --skip-chars=N N -u, --unique -z, --zero-terminated NUL -w, --check-chars=N N --help --version / "uniq" "sort -u" "uniq" Richard M. Stallman David MacKenzie GNU coreutils Copyright (C) 2022 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later . This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. comm(1), join(1), sort(1) info '(coreutils) uniq invocation' man man https://github.com/man-pages-zh/manpages- zh GNU coreutils 9.1 20229 UNIQ(1)