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User Commands uniq(1)
NAME
uniq - report or filter out repeated lines in a file
SYNOPSIS
uniq [-c | -d | -u] [-f fields] [-s char] [ input_file
[output_file]]
uniq [-c | -d | -u] [-n] [ + m] [ input_file
[output_file]]
DESCRIPTION
The uniq utility will read an input file comparing adjacent
lines, and write one copy of each input line on the output.
The second and succeeding copies of repeated adjacent input
lines will not be written.
Repeated lines in the input will not be detected if they are
not adjacent.
OPTIONS
The following options are supported:
-c Precedes each output line with a count of
the number of times the line occurred in the
input.
-d Suppresses the writing of lines that are not
repeated in the input.
-f fields Ignores the first fields fields on each
input line when doing comparisons, where
fields is a positive decimal integer. A
field is the maximal string matched by the
basic regular expression:
[[:blank:]]*[^[:blank:]]*
If fields specifies more fields than appear
on an input line, a null string will be used
for comparison.
-s chars Ignores the first chars characters when
doing comparisons, where chars is a positive
decimal integer. If specified in conjunction
with the -f option, the first chars
SunOS 5.10 Last change: 20 Dec 1996 1
User Commands uniq(1)
characters after the first fields fields
will be ignored. If chars specifies more
characters than remain on an input line, a
null string will be used for comparison.
-u Suppresses the writing of lines that are
repeated in the input.
-n Equivalent to -f fields with fields set to
n.
+m Equivalent to -s chars with chars set to m.
OPERANDS
The following operands are supported:
input_file A path name of the input file. If input_file
is not specified, or if the input_file is -,
the standard input will be used.
output_file A path name of the output file. If
output_file is not specified, the standard
output will be used. The results are
unspecified if the file named by output_file
is the file named by input_file.
EXAMPLES
Example 1: Using the uniq command
The following example lists the contents of the uniq.test
file and outputs a copy of the repeated lines.
example% cat uniq.test
This is a test.
This is a test.
TEST.
Computer.
TEST.
TEST.
Software.
SunOS 5.10 Last change: 20 Dec 1996 2
User Commands uniq(1)
example% uniq -d uniq.test
This is a test.
TEST.
example%
The next example outputs just those lines that are not
repeated in the uniq.test file.
example% uniq -u uniq.test
TEST.
Computer.
Software.
example%
The last example outputs a report with each line preceded by
a count of the number of times each line occurred in the
file:
example% uniq -c uniq.test
2 This is a test.
1 TEST.
1 Computer.
2 TEST.
1 Software.
example%
ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment
variables that affect the execution of uniq: LANG, LC_ALL,
LC_CTYPE, LC_MESSAGES, and NLSPATH.
EXIT STATUS
The following exit values are returned:
0 Successful completion.
>0 An error occurred.
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
SunOS 5.10 Last change: 20 Dec 1996 3
User Commands uniq(1)
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWesu |
|_____________________________|_____________________________|
| CSI | Enabled |
|_____________________________|_____________________________|
| Interface Stability | Standard |
|_____________________________|_____________________________|
SEE ALSO
comm(1), pack(1), pcat(1), sort(1), uncompress(1), attri-
butes(5), environ(5), standards(5)
SunOS 5.10 Last change: 20 Dec 1996 4
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This page was generated on Wed Sep 12 11:25:36 GMT 2007
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