UNIQ(C) XENIX System V UNIQ(C)
Name
uniq - Reports repeated lines in a file.
Syntax
uniq [ -udc [ +n ] [ -n ] ] [ input [ output ] ]
Description
uniq reads the input file and compares adjacent lines. In
the normal case, the second and succeeding copies of
repeated lines are removed; the remainder is written on the
output file. Input and output should always be different.
Note that repeated lines must be adjacent in order to be
found; see sort(C). If the -u flag is used, just the lines
that are not repeated in the original file are output. The
-d option specifies that one copy of just the repeated lines
is to be written. The normal mode output is the union of
the -u and -d mode outputs.
The -c option supersedes -u and -d and generates an output
report in default style but with each line preceded by a
count of the number of times it occurred.
The n arguments specify skipping an initial portion of each
line in the comparison:
-n The first n fields together with any blanks before
each are ignored. A field is defined as a string of
nonspace, nontab characters separated by tabs and
spaces from its neighbors.
+n The first n characters are ignored. Fields are
skipped before characters.
See Also
comm(C), sort(C)
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