Linux Common Commands--uniq

1. Function: Output or delete duplicate rows, but the same row will be in the adjacent row

2. Syntax:uniq [OPTION] ... [INPUT [OUTPUT]]

3. Parameters:

-C,--count shows the number of occurrences of recurrence next to each column

-D,--repeated show only recurring rows

-D,--all-repeated[=delimit-method] Displays all occurrences of duplicate rows

-F,--skip-fields=n skip the first N rows

-I,--ignore-case ignore case

-S,--skip-chars=n skips the first N characters

-U,--unique prints only the only rows that appear

-W Specifies the characters to compare

4. Example

1. In the case of unsorted, direct use of the Uniq command does not view duplicate rows.

[Email protected] ~]$ Uniq week.txt

Mon

Tue

Wed

Thu

Fri

Mon

Tue

Wed

Thu

Fri

Mon

Tue

Wed

Thu

Fri

2. After using sorting, you can use Uniq to remove duplicate rows.

[Email protected] ~]$ sort week.txt |uniq

Fri

Fri

Mon

Mon

Thu

Thu

Tue

Tue

Wed

Wed

3. After using the-i parameter, the number of rows displayed is even less.

[Email protected] ~]$ sort Week.txt |uniq-i

Fri

Mon

Thu

Tue

Wed

4. With the-c parameter, the number of occurrences per row appears next to each column.

[Email protected] ~]$ sort week.txt |uniq-i-C

3 Fri

3 Mon

3 Thu

3 Tue

3 Wed

5. To test the-D parameter, add the SAT and Sun in the Week.txt file

[Email protected] ~]$ sort Week.txt |uniq-i

Fri

Mon

Sat

Sun

Thu

Tue

Wed

[Email protected] ~]$ sort week.txt |uniq-i-D

Fri

Mon

Thu

Tue

Wed

6. With the-d parameter, all duplicate rows are displayed, while sat and Sun are not displayed.

[Email protected] ~]$ sort week.txt |uniq-i-D

Fri

Fri

Fri

Mon

Mon

Mon

Thu

Thu

Thu

Tue

Tue

Tue

Wed

Wed

Wed

7. Use-U only shows sat and sun two lines

[Email protected] ~]$ sort Week.txt |uniq-i-u

Sat

Sun

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Linux Common Commands--uniq