Discard all but one of successive identical lines from INPUT (or
standard input), writing to OUTPUT (or standard output).
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-c, --count
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prefix lines by the number of occurrences
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-d, --repeated
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only print duplicate lines
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-D, --all-repeated[=delimit-method] print all duplicate lines
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delimit-method={none(default),prepend,separate}
Delimiting is done with blank lines.
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-f, --skip-fields=N
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avoid comparing the first N fields
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-i, --ignore-case
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ignore differences in case when comparing
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-s, --skip-chars=N
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avoid comparing the first N characters
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-u, --unique
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only print unique lines
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-w, --check-chars=N
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compare no more than N characters in lines
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--help
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display this help and exit
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--version
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output version information and exit
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A field is a run of whitespace, then non-whitespace characters.
Fields are skipped before chars.