uniq.1: add [input [output]] information
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uniq.1
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uniq.1
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.Op Ar input Op Ar output
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.Sh DESCRIPTION
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.Nm
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reads
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.Ar file
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and writes one copy of a line from each group of consecutive
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duplicate lines to stdout. If no
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.Ar file
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is given,
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reads the
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.Ar input
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file and writes one copy of a line from each group of consecutive
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duplicate lines to the
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.Ar output
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file. If no
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.Ar input
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file is given,
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.Nm
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reads from stdin.
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reads from stdin. If no
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.Ar output
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file is given, then
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.Nm
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writes to stdout.
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.Sh OPTIONS
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.Bl -tag -width Ds
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.It Fl c
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