chore: integrated notions from articles on bash

knowledge base/sort.md

@@ -1,23 +1,35 @@
 # Sort
 
+## Table of contents <!-- omit in toc -->
+
+1. [TL;DR](#tldr)
+1. [Sort by the value in the last field](#sort-by-the-value-in-the-last-field)
+1. [Sources](#sources)
+
 ## TL;DR
 
 ```sh
 # Sort given lines.
-sort path/to/file
+sort 'path/to/file'
 
 # Sort lines in reverse.
-sort -r path/to/file
+sort -r 'path/to/file'
 
 # Sort lines numerically.
-sort -n path/to/file
+sort -n 'path/to/file'
 
 # Sort lines and remove duplicates.
-sort -u path/to/file
+sort -u 'path/to/file'
+
+# Sort lines in random order.
+sort -R 'path/to/file'
+
+# Sort lines numerically according to the value in the 3rd column.
+sort -t $'\t' -k 3n,3 'path/to/file'
 
 # Sort by the value in the last field.
 awk 'BEGIN {FS=","; OFS="|"} {print $NF,$0}' file.txt \
-  | sort -n -t '|' | awk -F '|' '{print $NF}'
+| sort -n -t '|' | awk -F '|' '{print $NF}'
 ```
 
 ## Sort by the value in the last field
@@ -45,5 +57,11 @@ awk 'BEGIN {FS=","; OFS="|"} {print $NF,$0}' file.txt \
 ## Sources
 
 - [Sort a file in Unix based on the last field]
+- [The essential Bash cheat sheet]
 
+<!-- project's references -->
+<!-- in-article references -->
+<!-- internal references -->
+<!-- external references -->
 [sort a file in unix based on the last field]: http://www.unixcl.com/2010/11/sort-file-based-on-last-field-unix.html
+[the essential bash cheat sheet]: https://betterprogramming.pub/the-essential-bash-cheat-sheet-e1c3df06560