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Add "Get the username of the current user" entry

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Crestwave
2019-01-19 15:34:11 +08:00
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manuscript/chapter0.txt
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# 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 -->

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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.

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manuscript/chapter19.txt
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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