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 the use of uniq command?
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.
What does uniq do in Unix?
uniq is a utility command on Unix, Plan 9, Inferno, and Unix-like operating systems which, when fed a text file or STDIN, outputs the text with adjacent identical lines collapsed to one, unique line of text.
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. …
What does the sort command do in Linux?
The sort command is a command line utility for sorting lines of text files. It supports sorting alphabetically, in reverse order, by number, by month and can also remove duplicates.
How do I sort uniq 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.
Who WC Linux?
wc stands for word count. As the name implies, it is mainly used for counting purpose. It is used to find out number of lines, word count, byte and characters count in the files specified in the file arguments.
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.
What does AWK do in bash?
AWK is a programming language that is designed for processing text-based data, either in files or data streams, or using shell pipes. In other words you can combine awk with shell scripts or directly use at a shell prompt. This pages shows how to use awk in your bash shell scripts.
What is tr in shell script?
The tr command in UNIX is a command line utility for translating or deleting characters. It supports a range of transformations including uppercase to lowercase, squeezing repeating characters, deleting specific characters and basic find and replace. It can be used with UNIX pipes to support more complex translation.
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.
What is $? In Unix?
The $? variable represents the exit status of the previous command. Exit status is a numerical value returned by every command upon its completion. … For example, some commands differentiate between kinds of errors and will return various exit values depending on the specific type of failure.
How do you sort words in Linux?
Sort lines of a text file
- To sort the file in alphabetical order, we can use the sort command without any options:
- To sort in reverse, we can use the -r option:
- We can also sort on the column. …
- Blank space is the default field separator. …
- In the picture above, we have sorted the file sort1.