uniq(1) DG/UX 4.30 uniq(1)
NAME
uniq - report repeated lines in a file
SYNOPSIS
uniq [ -udc [ +n ] [ -n ] ] [ input [ output ] ]
DESCRIPTION
Uniq 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. Input and output should always be different. Note
that repeated lines must be adjacent in order to be found;
see sort(1).
OPTIONS
-u Output just the lines that are not repeated in the
original file.
-d Writes one copy of just the repeated lines. The normal
mode output is the union of the -u and -d mode outputs.
-c Ignore the -u and -d options and generate an output
report in default style, but precede each line with the
number of times the line 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 a string of non-
space, non-tab characters separated by tabs and
spaces from its neighbors.
+n The first n characters are ignored. Fields are
skipped before characters.
EXAMPLES
$ cat infile
This is not a unique file.
This is not a unique file.
This line occurs once.
The next line will not count as the third occurence.
This is not a unique file.
$ uniq -c infile
2 This is not a unique file.
1 This line occurs once.
1 The next line will not count as the third occurence.
1 This is not a unique file.
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uniq(1) DG/UX 4.30 uniq(1)
The above example finds repeated lines in a file. NOTE:
Only repeated adjacent lines are considered repeated.
SEE ALSO
comm(1), sort(1).
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