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Quick links About
uniq
Syntax
Examples
Related commands
Linux / Unix main page
About uniq
Report or filter out repeated lines in a file.
Syntax
uniq [-c | -d | -u ] [ -f fields ] [ -s char ]
[-n] [+m] [input_file [ output_file ] ]
| -c |
Precede each output line with a count of the number of times the line occurred in the input. |
| -d |
Suppress the writing of lines that are not
repeated in the input. |
| -u |
Suppress the writing of lines that are repeated in the input. |
| -f fields |
Ignore 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.
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| -s char |
Ignore 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 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. |
| -n |
Equivalent to -f fields with fields set to n. |
| +m |
Equivalent to -s chars with chars set to m. |
| 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
uniq myfile1.txt > myfile2.txt -
Removes duplicate lines in the first file1.txt and outputs the results
to the second file.
Related commands
comm
pack
pcat
sort
uncompress
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