diff --git a/README.md b/README.md
index 4c86c4a..43555ca 100644
--- a/README.md
+++ b/README.md
@@ -147,6 +147,7 @@ See something incorrectly described, buggy or outright wrong? Open an issue or s
     * [Use `read` as an alternative to the `sleep` command](#use-read-as-an-alternative-to-the-sleep-command)
     * [Check if a program is in the user's PATH](#check-if-a-program-is-in-the-users-path)
     * [Get the current date using `strftime`](#get-the-current-date-using-strftime)
+    * [Get the username of the current user](#get-the-username-of-the-current-user)
     * [Generate a UUID V4](#generate-a-uuid-v4)
     * [Progress bars](#progress-bars)
     * [Get the list of functions in a script](#get-the-list-of-functions-in-a-script)
@@ -1875,6 +1876,17 @@ $ printf '%s\n' "$date"
 Fri 15 Jun  - 10:00 AM
 ```
 
+## Get the username of the current user
+
+**CAVEAT:** Requires `bash` 4.4+
+
+```shell
+$ : \\u
+# Expand the parameter as if it were a prompt string
+$ printf '%s\n' "${_@P}"
+black
+```
+
 ## Generate a UUID V4
 
 **CAVEAT**: The generated value is not cryptographically secure.
diff --git a/manuscript/chapter0.txt b/manuscript/chapter0.txt
index fe58b4d..7db2b95 100644
--- a/manuscript/chapter0.txt
+++ b/manuscript/chapter0.txt
@@ -1,10 +1,10 @@
 # FOREWORD
 
-A collection of pure `bash` alternatives to external processes and programs. The `bash` scripting language is more powerful than people realise and most tasks can be accomplished without the need for or dependence on external programs.
+A collection of pure `bash` alternatives to external processes and programs. The `bash` scripting language is more powerful than people realise and most tasks can be accomplished without depending on external programs.
 
-Calling an external process in `bash` is expensive and excessive use will cause a noticeable slowdown. Scripts and programs written using built-in methods (*where applicable*) will be faster, require less dependencies and afford a better understanding of the language itself.
+Calling an external process in `bash` is expensive and excessive use will cause a noticeable slowdown. Scripts and programs written using built-in methods (*where applicable*) will be faster, require fewer dependencies and afford a better understanding of the language itself.
 
-The content of this book provides a reference for solving problems encountered when writing programs and scripts in `bash`. Examples are in function format showcasing how to incorporate these solutions into code.
+The contents of this book provide a reference for solving problems encountered when writing programs and scripts in `bash`. Examples are in function formats showcasing how to incorporate these solutions into code.
 
 <!-- CHAPTER END -->
 
diff --git a/manuscript/chapter1.txt b/manuscript/chapter1.txt
index 6bfb4f4..42f2d40 100644
--- a/manuscript/chapter1.txt
+++ b/manuscript/chapter1.txt
@@ -64,7 +64,7 @@ John Black is my name.
 The result of `bash`'s regex matching can be used to replace `sed` for a
 large number of use-cases.
 
-**CAVEAT**: This is one of the few platform dependant `bash` features.
+**CAVEAT**: This is one of the few platform dependent `bash` features.
 `bash` will use whatever regex engine is installed on the user's system.
 Stick to POSIX regex features if aiming for compatibility.
 
diff --git a/manuscript/chapter19.txt b/manuscript/chapter19.txt
index ade89b2..bf9ec70 100644
--- a/manuscript/chapter19.txt
+++ b/manuscript/chapter19.txt
@@ -82,8 +82,21 @@ $ printf '%s\n' "$date"
 Fri 15 Jun  - 10:00 AM
 ```
 
+## Get the username of the current user
+
+**CAVEAT:** Requires `bash` 4.4+
+
+```shell
+$ : \\u
+# Expand the parameter as if it were a prompt string
+$ printf '%s\n' "${_@P}"
+black
+```
+
 ## Generate a UUID V4
 
+**CAVEAT**: The generated value is not cryptographically secure.
+
 **Example Function:**
 
 ```sh