-c, --count
prefix lines by the number of occurrences
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-d, --repeated
only print duplicate lines
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-D, --all-repeated[=delimit-method]
print all duplicate lines delimit-method={none(default),prepend,separate} Delimiting is done with
blank lines
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-f, --skip-fields=N
avoid comparing the first N fields
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-i, --ignore-case
ignore differences in case when comparing
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-s, --skip-chars=N
avoid comparing the first N characters
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-u, --unique
only print unique lines
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-z, --zero-terminated
end lines with 0 byte, not newline
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-w, --check-chars=N
compare no more than N characters in lines
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--help display this help and exit
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--version
output version information and exit
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