Info 7.2 `uniq': Uniquify files:
By default, `uniq' prints its input lines, except that it discards
all but the first of adjacent repeated lines, so that no output lines
are repeated. Optionally, it can instead discard lines that are not
repeated, or all repeated lines.
^^^^^^^^^^^^^^^^^^^^^^But that is what it does in the first place.
`-D'
`--all-repeated[=DELIMIT-METHOD]'
Do not discard the second and subsequent repeated input lines, but
discard lines that are not repeated.
Mention what if you want even the first of the repeated lines!
Man page:
-d, --repeated
only print duplicate lines
Say instead
only print (the first of each group of) duplicate lines
Even if it is said on the Info page.
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