The usage of the Linux basic command uniq
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Uniq
The repeated lines in the file are deleted and the results are sent to standard output or the specified file. Before using the uniq directive, you must use sort to sort the content, otherwise it has no effect. If there is no option, the matching rows are merged into the first match.
The scope of this command: RedHat, RHEL, Ubuntu, CentOS, SUSE, openSUSE, Fedora.
1. Grammar
Uniq [options] [input] [output]
2. List of options
Option
Description
-- version
Display command version information
-- help
Show help documentation
-c |-- count
Displays the number of times the row is repeated
-d |-- repeated
Show only recurring lines
-D |-- all-repeated [= delimit-method]
Print all duplicate lines
-f |-- skip-fields=N
Ignore the first n fields
-I |-- ignore-case
Ignore case when comparing
-s |-- skip-chars=N
Ignore the first n characters
-u |-- unique
Show only rows that do not repeat
-z |-- zero-terminated
Finishes with 0 bytes instead of newline
-w |-- check-chars=N
The comparison does not exceed the specified number of times
3. Examples
1) Delete duplicate lines
[root@192 weijie] # cat 3.c / / View content
Nihao linux.
I am david.
Nihao linux.
I am david.
[root@192 weijie] # sort 3.c | uniq-c / / sort first, and then delete duplicate rows, showing the number of duplicate rows
2 i am david.
2 nihao linux.
2) only rows that do not repeat are displayed
[root@localhost weijie] # cat 3.c / / View content
Nihao linux.
I am david.
Nihao linux.
I am david.
I love linux
[root@localhost weijie] # sort 3.c | uniq-c-u / / displays only lines that do not repeat
1 i love linux
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