UNIQ
Section: User Commands (1)
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BSD mandoc
NAME
uniq
- report or filter out repeated lines in a file
SYNOPSIS
[-c | -d | -u
]
[-f fields
]
[-s chars
]
[input_file
[output_file
]
]
DESCRIPTION
The
utility reads the standard input comparing adjacent lines, and writes
a copy of each unique input line to the standard output.
The second and succeeding copies of identical adjacent input lines are
not written.
Repeated lines in the input will not be detected if they are not adjacent,
so it may be necessary to sort the files first.
The following options are available:
- -c
-
Precede each output line with the count of the number of times the line
occurred in the input, followed by a single space.
- -d
-
Don't output lines that are not repeated in the input.
- -f fields
-
Ignore the first
fields
in each input line when doing comparisons.
A field is a string of non-blank characters separated from adjacent fields
by blanks.
Field numbers are one based, i.e. the first field is field one.
- -s chars
-
Ignore the first
chars
characters in each input line when doing comparisons.
If specified in conjunction with the
-f
option, the first
chars
characters after the first
fields
fields will be ignored.
Character numbers are one based, i.e. the first character is character one.
- -u
-
Don't output lines that are repeated in the input.
If additional arguments are specified on the command line, the first
such argument is used as the name of an input file, the second is used
as the name of an output file.
The
utility exits 0 on success, and >0 if an error occurs.
COMPATIBILITY
The historic
+ number
and
-number
options have been deprecated but are still supported in this implementation.
SEE ALSO
sort(1)
STANDARDS
The
utility is expected to be
St -p1003.2
compatible.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- COMPATIBILITY
-
- SEE ALSO
-
- STANDARDS
-
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