How do I get unique records in Unix?

To find unique occurrences where the lines are not adjacent a file needs to be sorted before passing to uniq . uniq will operate as expected on the following file that is named authors. txt . As duplicates are adjacent uniq will return unique occurrences and send the result to standard output.

How do I find unique records in Unix?

Let us now see the different ways to find the duplicate record.

  1. Using sort and uniq: $ sort file | uniq -d Linux. …
  2. awk way of fetching duplicate lines: $ awk ‘{a[$0]++}END{for (i in a)if (a[i]>1)print i;}’ file Linux. …
  3. Using perl way: …
  4. Another perl way: …
  5. A shell script to fetch / find duplicate records:

How do I get unique values from a column in Unix?

2 Alternatives + Submit Alt

  1. Display unique values of a column. the column number is ‘6’ cut -d’,’ -f6 file.csv | sort | uniq. richie · 2013-04-10 14:05:32 1.
  2. Display unique values of a column. 3 is the column’s number. -3. cut -f 3 | uniq. flxndn · 2012-06-06 10:48:41 2.

How do I get unique lines in a file?

Find unique lines

  1. The file must be sorted first. sort file | uniq -u will output to console for you. – ma77c. …
  2. 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.
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How do I remove duplicates in Unix?

You need to use shell pipes along with the following two Linux command line utilities to sort and 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 you find repeated words in Linux?


  1. First you can tokenize the words with grep -wo , each word is printed on a singular line.
  2. Then you can sort the tokenized words with sort .
  3. Finally can find consecutive unique or duplicate words with uniq . 3.1. uniq -c This prints the words and their count.

How do I get unique entries in Linux?

uniq Command in LINUX with examples

  1. Syntax of uniq Command : …
  2. Options For uniq Command: …
  3. Using -c option : It tells the number of times a line was repeated. …
  4. Using -D option : It also prints only duplicate lines but not one per group. …
  5. Using -u option : It prints only the unique lines.

How do I print a column in Linux?

How to do it…

  1. To print the fifth column, use the following command: $ awk ‘{ print $5 }’ filename.
  2. We can also print multiple columns and insert our custom string in between columns. For example, to print the permission and filename of each file in the current directory, use the following set of commands:

What does cd command do in Unix?

The change directory (cd) command is built into the system shell and changes the current working directory. The cd command can be used to either change to a directory that is relative to the the location of the current working directory or to an absolute location in the filesystem.

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Which command is used to identify files?

The ‘file’ command is used to identify the types of file. This command tests each argument and classifies it. The syntax is ‘file [option] File_name’.

How do I sort unique lines in Linux?

The Linux utilities sort and uniq are useful for ordering and manipulating data in text files and as part of shell scripting. The sort command takes a list of items and sorts them alphabetically and numerically. The uniq command takes a list of items and removes adjacent duplicate lines.

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.

Which command is used to remove duplicate records?

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.

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