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How use uniq command in Unix with example?
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 does uniq command do in Unix?
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 you put the output of a command into a file in Unix?
To use bash redirection, you run a command, specify the > or >> operator, and then provide the path of a file you want the output redirected to. > redirects the output of a command to a file, replacing the existing contents of the file.
How do you show unique files 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 does the uniq command work in Linux?
As you can see that we just used the name of input file in the above uniq example and as we didn’t use any output file to store the produced output, the uniq command displayed the filtered output on the standard output with all the duplicate lines removed. Note: uniq isn’t able to detect the duplicate lines unless they are adjacent to each other.
How does UNIQ read from standard input file?
uniq filters out adjacent, matching lines from input file INPUT, writing the filtered data to output file OUTPUT. If INPUT is not specified, uniq reads from the standard input.
How to run UNIQ on fruits.txt file?
For example, consider a file fruits.txt with the following lines of text: If you run uniq on these lines of text, every line that matches an adjacent line is omitted: uniq [ OPTION ]… [ INPUT [ OUTPUT ]] Prefix lines with a number representing how many times they occurred.
How to skip fields in UNIQ in Linux?
-f N – -skip-fields (N) : It allows you to skip N fields (a field is a group of characters, delimited by whitespace) of a line before determining uniqueness of a line. -i – -ignore case : By default, comparisons done are case sensitive but with this option case insensitive comparisons can be made.