Unix and Linux Discussions Tagged with i o |
|
Thread / Thread Starter |
Last Post |
Replies |
Views |
Forum |
|
|
|
17 |
26,238 |
UNIX for Beginners Questions & Answers |
|
|
|
0 |
10,674 |
Shell Programming and Scripting |
|
|
|
1 |
2,977 |
Shell Programming and Scripting |
|
|
|
7 |
15,614 |
Programming |
|
|
|
2 |
2,932 |
UNIX for Advanced & Expert Users |
|
|
|
3 |
2,789 |
UNIX for Dummies Questions & Answers |
|
|
|
3 |
3,300 |
UNIX for Dummies Questions & Answers |
|
|
|
6 |
4,166 |
UNIX for Dummies Questions & Answers |
|
|
|
4 |
4,011 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
4,298 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
3,562 |
Programming |
|
|
|
4 |
3,230 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
5,942 |
UNIX for Dummies Questions & Answers |
|
|
|
3 |
3,255 |
UNIX for Dummies Questions & Answers |
|
|
|
4 |
4,136 |
UNIX for Dummies Questions & Answers |
|
|
|
4 |
6,993 |
IP Networking |
|
|
|
2 |
4,072 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
2,754 |
UNIX for Dummies Questions & Answers |
|
|
|
5 |
5,663 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
3,383 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
5,166 |
UNIX for Dummies Questions & Answers |
|
|
|
3 |
5,032 |
UNIX for Dummies Questions & Answers |
uniq(1) General Commands Manual uniq(1)
Name
uniq - report repeated lines in a file
Syntax
uniq [-udc[+n][-n]] [input[output]]
Description
The command 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. Note that repeated lines must be adjacent in order to be found. For further infor-
mation, see
Options
The n arguments specify skipping an initial portion of each line in the comparison:
-n Skips specified number of fields. A field is defined as a string of non-space, non-tab characters separated by tabs and spaces from its
neighbors.
+n Skips specified number of characters in addition to fields. Fields are skipped before characters.
-c Displays number of repetitions, if any, for each line.
-d Displays only lines that were repeated.
-u Displays only unique (nonrepeated) lines.
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.
See Also
comm(1), sort(1)
uniq(1)