Description of unix sort (#22403)

A sort description of unix sort

guide/english/bash/bash-sort/index.md

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+---
+title: Bash Sort
+---
+
+## Bash Sort
+
+Sort is one a simple and useful command which will rearrange the lines in a text file so that they are sorted, numerically and alphabetically. There are by default the following rules for sorting text:
+
+* numbers will appear befor a letter
+* letter that appears earlier in the alphabet will appear before a letter that appears later in the alphabet 
+* lowercase letters will appear before lines with the same letter in uppercase
+
+The default rules of sorting can be changes by the options you provice to the command.
+
+### Usage
+
+```bash
+sort [options] [file_names]
+```
+
+Most used options:
+
+* `-b`, ignore leading blanks.
+* `-f`, fold lower case to upper case characters.
+* `-h`, compare human readable numbers (e.g., "2K", "1G").
+* `-r`, reverse the result of comparisons.
+* `-R`, sort in a random order
+
+
+### Example
+
+We have a file **data.txt**, which contains the following text:
+```bash
+apples
+oranges
+pears
+kiwis
+bananas
+```
+To sort the lines in the file alphabetically, use the following command:
+
+```bash
+sort data.txt
+```
+which will produce the following output:
+```bash
+apples
+bananas
+kiwis
+oranges
+pears
+```
+
+To reverse the sorting order, we using the `-r` flag.
+```bash
+sort -r data.txt
+```
+which will produce the following output:
+```bash
+pears
+oranges
+kiwis
+bananas
+apples
+```
+
+#### More Information:
+* Wikipedia: https://en.wikipedia.org/wiki/Sort_(Unix)