What is the use of uniq command in Unix?

What is the use of uniq command in Unix?

The uniq command can count and print the number of repeated lines. Just like duplicate lines, we can filter unique lines (non-duplicate lines) as well and can also ignore case sensitivity. We can skip fields and characters before comparing duplicate lines and also consider characters for filtering lines.

What is unique command explain with example?

The linux uniq command is basically used to remove all repeated lines in a file. This command is used when a line is repeated multiple times and replace these multiple lines with one line. This command is designed to work on sorted files.

How does uniq command works explain various options of the uniq command with examples?

In simple words, uniq is the tool that helps to detect the adjacent duplicate lines and also deletes the duplicate lines. uniq filters out the adjacent matching lines from the input file(that is required as an argument) and writes the filtered data to the output file.

Which command is used to filter repeated lines?

Linux uniq command is used to remove all the repeated lines from a file. Also, it can be used to display a count of any word, only repeated lines, ignore characters, and compare specific fields. It is one of the most frequently used commands in the Linux system.

How do I find unique UNIX records?

The uniq command in UNIX is a command line utility for reporting or filtering repeated lines in a file. It can remove duplicates, show a count of occurrences, show only repeated lines, ignore certain characters and compare on specific fields.

What is a uniq?

uniq is a utility command on Unix, Plan 9, Inferno, and Unix-like operating systems which, when fed a text file or standard input, outputs the text with adjacent identical lines collapsed to one, unique line of text.

How do I remove duplicates in Unix?

How do I get unique words in Linux?

One of the easiest way to get the number of unique words in your file: tr ‘ ‘ ‘\n’ < file_name | sort | uniq -c | wc -l.

How do I find duplicates in a text file?

To start your duplicate search, go to File -> Find Duplicates or click the Find Duplicates button on the main toolbar. The Find Duplicates dialog will open, as shown below. The Find Duplicates dialog is intuitive and easy to use. The first step is to specify which folders should be searched for duplicates.

How do I remove duplicates in UNIX?

How do I remove duplicate lines in files?

Remove duplicate lines with uniq

If you don’t need to preserve the order of the lines in the file, using the sort and uniq commands will do what you need in a very straightforward way. The sort command sorts the lines in alphanumeric order. The uniq command ensures that sequential identical lines are reduced to one.

What is uniq in bash?

uniq command is used to detect the adjacent lines from a file and write the content of the file by filtering the duplicate values or write only the duplicate lines into another file.

How do I delete duplicate files?

We recommend that you keep the original file.

1. On your Android device, open Files by Google .
2. At the bottom, tap Clean .
3. On the “Duplicate files” card, tap Select files.
4. Select the files you want to delete.
5. At the bottom, tap Delete .
6. On the confirmation dialog, tap Delete .

How do you grep unique words?

Solution:

1. Using grep and head command. Pipe the output of grep command to head command to get the first line.
2. Using m option of grep command. The m option can be used to display the number of matching lines.
3. Using the sed command. We can also use the sed command to print unique occurrence of a pattern.
4. Using awk command.

How do I check for duplicates in Unix?

The uniq command in Linux is used to display identical lines in a text file. This command can be helpful if you want to remove duplicate words or strings from a text file. Since the uniq command matches adjacent lines for finding redundant copies, it only works with sorted text files.

How do I find duplicate values?

Find and remove duplicates

1. Select the cells you want to check for duplicates.
2. Click Home > Conditional Formatting > Highlight Cells Rules > Duplicate Values.
3. In the box next to values with, pick the formatting you want to apply to the duplicate values, and then click OK.

How do you remove duplicate records 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.

What are 5 Linux commands?

The Most-Used Linux Commands

• ls Command.
• alias Command.
• unalias Command.
• pwd Command.
• cd Command.
• cp Command.
• rm Command.
• mv Command.

How do you remove duplicate rows in Unix?

Linux Shell – How To Remove Duplicate Text Lines

1. sort command – Sort lines of text files in Linux and Unix-like systems.
2. uniq command – Rport or omit repeated lines on Linux or Unix.

How do I grep multiple values?

How do I grep for multiple patterns?

1. Use single quotes in the pattern: grep ‘pattern*’ file1 file2.
2. Next use extended regular expressions: egrep ‘pattern1|pattern2’ *. py.
3. Finally, try on older Unix shells/oses: grep -e pattern1 -e pattern2 *. pl.
4. Another option to grep two strings: grep ‘word1\|word2’ input.

How do you find unique words in Unix?

There are various ways to do so in unix. One of the easiest way to get the number of unique words in your file: tr ‘ ‘ ‘\n’ < file_name | sort | uniq -c | wc -l.
…
From grep man page :

1. -o, –only-matching.
2. Print only the matched (non-empty) parts of a matching.
3. line, with each such part on a separate output line.

How do I find duplicate files?

How do I remove duplicates from a list?

Given an ArrayList with duplicate values, the task is to remove the duplicate values from this ArrayList in Java.
Approach:

1. Get the ArrayList with duplicate values.
2. Create a new List from this ArrayList.
3. Using Stream(). distinct() method which return distinct object stream.
4. convert this object stream into List.

How can I delete duplicate records?

Remove duplicate values

1. 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.
2. Click Data > Remove Duplicates, and then Under Columns, check or uncheck the columns where you want to remove the duplicates.
3. Click OK.

How do I remove duplicates from two files?

To remove common lines between two files you can use grep , comm or join command. grep only works for small files. Use -v along with -f . This displays lines from file1 that do not match any line in file2 .