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[unix-history] / man / man1 / uniq.1

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NAME            uniq -- report repeated lines in a file
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SYNOPSIS        uniq\b\b\b\b____ [ -ud\b\b\b___ ]  [ input [ output ] ]
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DESCRIPTION     uniq\b\b\b\b____
reads the input
file comparing adjacent lines.
In the normal case, the second and succeeding copies
of repeated lines are
removed; the remainder is written on the output file.
Note that repeated lines must be adjacent
in order to be found.
(See sort(I))
If the -u\b\b__ flag is used,
just the lines that are not repeated
in the original file are output.
The -d\b\b__ option specifies that
one copy of just the repeated lines is to
be written.
Note that the normal mode output is the union of the
-u\b\b__ and -d\b\b__ mode outputs.
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The following example will print one copy of all
lines in the file a\b_ that do not occur in b\b_:
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       sort a x
       uniq x a1
       sort b x
       uniq x b1
       cat a1 b1 >x
       sort x
       uniq -u x >>a1
       sort a1
       uniq -d a1
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FILES           --
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SEE ALSO        sort(I)
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DIAGNOSTICS     "cannot open input", "cannot create output"
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BUGS            --