You asked: How do I reverse sort in Linux?

To sort in reverse order pass the -r option to sort . This will sort in reverse order and write the result to standard output. Using the same list of metal bands from the previous example this file can be sorted in reverse order with the -r option.

How do I sort a Linux file in reverse order?

-r Option: Sorting In Reverse Order : You can perform a reverse-order sort using the -r flag. the -r flag is an option of the sort command which sorts the input file in reverse order i.e. descending order by default. Example: The input file is the same as mentioned above.

How do I reverse sort list?

Sorting Using User-defined Order

  1. reverse: reverse=True will sort the list descending. Default is reverse=False.
  2. key: A function to specify the sorting criteria(s)

How do you reverse in Linux?

rev command in Linux is used to reverse the lines characterwise. This utility basically reverses the order of the characters in each line by copying the specified files to the standard output. If no files are specified, then the standard input will read.

How do you sort files in Linux?

How to Sort Files in Linux using Sort Command

  1. Perform Numeric Sort using -n option. …
  2. Sort Human Readable Numbers using -h option. …
  3. Sort Months of an Year using -M option. …
  4. Check if Content is Already Sorted using -c option. …
  5. Reverse the Output and Check for Uniqueness using -r and -u options.

What does sort do in Linux?

The sort command is used in Linux to print the output of a file in given order. This command processes on your data (the content of the file or output of any command) and reorders it in the specified way, which helps us to read the data efficiently.

What Linux command can read a file content in reverse?

Linux – Displaying a File in Reverse

  1. To view a file in reverse, there is simply the tac command. It is actually the CAT written in reverse: tac file.
  2. Like the command cat, you can concatenate several files, which will be put together, but in reverse: tac file1 file2 file3.

How do you sort an ArrayList in reverse order?

Approach: An ArrayList can be Sorted by using the sort() method of the Collections Class in Java. This sort() method takes the collection to be sorted and Collections. reverseOrder() as the parameter and returns a Collection sorted in the Descending Order. Collections.

What does reverse () do in Python?

Python List reverse() Python List reverse() is an inbuilt method in the Python programming language that reverses objects of the List in place. Parameters: There are no parameters.

How do you reverse in Unix?

rev command : It is used to reverse the lines in a file. This command can take standard input as well as shown below. Note: The rev command is not present in all flavors of Unix.

How do I reverse a string in Unix?

If rev command is installed use it as follows:

  1. echo “nixcraft” | rev.
  2. rev<<<“This is a test”
  3. perl -ne ‘chomp;print scalar reverse . ” …
  4. echo ‘nixcraft’ | perl -ne ‘chomp;print scalar reverse . “

How do you sort numerically in Linux?

To sort by number pass the -n option to sort . This will sort from lowest number to highest number and write the result to standard output. Suppose a file exists with a list of items of clothing that has a number at the start of the line and needs to be sorted numerically. The file is saved as clothes.

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 I list all directories in Linux?

See the following examples:

  1. To list all files in the current directory, type the following: ls -a This lists all files, including. dot (.) …
  2. To display detailed information, type the following: ls -l chap1 .profile. …
  3. To display detailed information about a directory, type the following: ls -d -l .
Like this post? Please share to your friends:
OS Today