-D, --all-repeated[=<delimit-method>]

print all duplicate lines. Delimiting is done with blank lines. [default: none]

[possible values: none, prepend, separate]

--group[=<group-method>]

show all items, separating groups with an empty line. [default: separate]

[possible values: separate, prepend, append, both]

-w, --check-chars <N>

compare no more than N characters in lines

-c, --count

prefix lines by the number of occurrences

-i, --ignore-case

ignore differences in case when comparing

-d, --repeated

only print duplicate lines

-s, --skip-chars <N>

avoid comparing the first N characters

-f, --skip-fields <N>

avoid comparing the first N fields

-u, --unique

only print unique lines

-z, --zero-terminated

end lines with 0 byte, not newline

-h, --help

Print help

-V, --version

Print version