Add "Get the username of the current user" entry
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README.md
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README.md
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@ -147,6 +147,7 @@ See something incorrectly described, buggy or outright wrong? Open an issue or s
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* [Use `read` as an alternative to the `sleep` command](#use-read-as-an-alternative-to-the-sleep-command)
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* [Check if a program is in the user's PATH](#check-if-a-program-is-in-the-users-path)
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* [Get the current date using `strftime`](#get-the-current-date-using-strftime)
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* [Get the username of the current user](#get-the-username-of-the-current-user)
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* [Generate a UUID V4](#generate-a-uuid-v4)
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* [Progress bars](#progress-bars)
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* [Get the list of functions in a script](#get-the-list-of-functions-in-a-script)
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@ -1875,6 +1876,17 @@ $ printf '%s\n' "$date"
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Fri 15 Jun - 10:00 AM
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```
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## Get the username of the current user
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**CAVEAT:** Requires `bash` 4.4+
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```shell
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$ : \\u
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# Expand the parameter as if it were a prompt string
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$ printf '%s\n' "${_@P}"
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black
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```
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## Generate a UUID V4
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**CAVEAT**: The generated value is not cryptographically secure.
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@ -1,10 +1,10 @@
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# FOREWORD
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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.
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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.
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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.
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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.
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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.
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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.
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<!-- CHAPTER END -->
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@ -64,7 +64,7 @@ John Black is my name.
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The result of `bash`'s regex matching can be used to replace `sed` for a
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large number of use-cases.
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**CAVEAT**: This is one of the few platform dependant `bash` features.
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**CAVEAT**: This is one of the few platform dependent `bash` features.
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`bash` will use whatever regex engine is installed on the user's system.
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Stick to POSIX regex features if aiming for compatibility.
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@ -82,8 +82,21 @@ $ printf '%s\n' "$date"
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Fri 15 Jun - 10:00 AM
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```
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## Get the username of the current user
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**CAVEAT:** Requires `bash` 4.4+
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```shell
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$ : \\u
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# Expand the parameter as if it were a prompt string
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$ printf '%s\n' "${_@P}"
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black
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```
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## Generate a UUID V4
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**CAVEAT**: The generated value is not cryptographically secure.
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**Example Function:**
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```sh
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