The uniq command is used to remove duplicate lines from a text file in Linux. By default, this command discards all but the first of adjacent repeated lines, so that no output lines are repeated. Optionally, it can instead only print duplicate lines. For uniq to work, you must first sort the output.
How do I remove duplicates in Unix?
uniq command retains only unique records from a file. In other words, uniq removes duplicates. However, uniq command needs a sorted file as input. sort with -u option removes all the duplicate records and hence uniq is not needed at all.
How do I get rid of duplicate lines?
Remove duplicate values
- Select the range of cells that has duplicate values you want to remove. Tip: Remove any outlines or subtotals from your data before trying to remove duplicates.
- Click Data > Remove Duplicates, and then Under Columns, check or uncheck the columns where you want to remove the duplicates. …
- Click OK.
How do I filter unique lines in Linux?
The uniq command in Linux is a command line utility that reports or filters out the repeated lines in a file. In simple words, uniq is the tool that helps to detect the adjacent duplicate lines and also deletes the duplicate lines.
How do I find duplicate rows in Unix?
How to find duplicate records of a file in Linux?
- Using sort and uniq: $ sort file | uniq -d Linux. …
- awk way of fetching duplicate lines: $ awk ‘{a[$0]++}END{for (i in a)if (a[i]>1)print i;}’ file Linux. …
- Using perl way: …
- Another perl way: …
- A shell script to fetch / find duplicate records:
What is the output of who command?
Explanation: who command output the details of the users who are currently logged in to the system. The output includes username, terminal name (on which they are logged in), date and time of their login etc. 11.
How do I eliminate duplicate rows in SQL?
SQL delete duplicate Rows using Common Table Expressions (CTE)
- WITH CTE([firstname],
- AS (SELECT [firstname],
- ROW_NUMBER() OVER(PARTITION BY [firstname],
- ORDER BY id) AS DuplicateCount.
- FROM [SampleDB].[ dbo].[ employee])
How do I eliminate duplicate rows in Excel and keep the highest value?
(1) Select Fruit column (which you will remove duplicates rows by), and then click the Primary Key button; (2) Select the Amount column (Which you will keep highest values in), and then click Calculate > Max. (3) Specify combination rules for other columns as you need.
How do I get unique lines in a file?
Find unique lines
- The file must be sorted first. sort file | uniq -u will output to console for you. – ma77c. …
- I think the reason sort file | uniq shows all the values 1 time is because it immediately prints the line it encounters the first time, and for the subsequent encounters, it just skips them. – Reeshabh Ranjan.
What is the use of awk in Linux?
Awk is a utility that enables a programmer to write tiny but effective programs in the form of statements that define text patterns that are to be searched for in each line of a document and the action that is to be taken when a match is found within a line. Awk is mostly used for pattern scanning and processing.
Which of the following filter is used to remove duplicate lines?
5. uniq : Removes duplicate lines.