os: move shell section under command-line

Author: practicalli-johnny

CHANGELOG.md

@@ -39,3 +39,4 @@
 - dev: checkout v4 action with sparse checkout scheduled version workflow
 - ci: optional setup-python for publish book workflow
 - dev: optional setup-python for publish book workflow
+- os: move shell section under command-line

docs/os/shell/bash.md renamed to docs/os/command-line/shell/bash.md

@@ -2,4 +2,6 @@
 
 Bash is a very common shell environment for Linux and is typically the default shell.
 
+![Bourne-Again shell logo](https://en.wikipedia.org/wiki/Bash_(Unix_shell)#/media/File:Gnu-bash-logo.svg){loading=lazy}
+
 ## Ohmybash

docs/os/shell/fish.md renamed to docs/os/command-line/shell/fish.md

@@ -1,19 +1,32 @@
 # Operating System Shell
 
- a shell is a computer program that exposes an operating system's services to a human user or other programs. In general, operating system shells use either a command-line interface (CLI) or graphical user interface (GUI), depending on a computer's role and particular operation. It is named a shell because it is the outermost layer around the operating system.[1][2]
+A shell is a computer program that exposes an operating system's services to a human user or other programs.
+
+Operating system shells use either a command-line interface (CLI) or graphical user interface (GUI), depending on a computer's role and particular operation. It is named a shell because it is the outermost layer around the operating system.
 
 Command-line shells require the user to be familiar with commands and their calling syntax, and to understand concepts about the shell-specific scripting language (for example, bash), while graphical shells place a low burden on beginning computer users and are characterized as being easy to use, yet most GUI-enabled operating systems also provide CLI shells, normally for performing advanced tasks.
 
 [Wikipedia: Shell - Computing](https://en.wikipedia.org/wiki/Shell_(computing)){target=_blank .md-button}
 
 ## Command Line Shell
 
-- bash
-- zsh
+- [bash](bash.md) Bourne Again Shell created as a free version of the Bourne Shell (`sh`)
+- [zsh](zsh.md) is an advanced shell with programable command-line completion, extended file globbing, improved variable & array handling and themeable prompts
+
+## Rich prompt
+
+The default shell prompt shows minimal information, e.g. an idicator if a user account is root (`#`) or regular user account (`$`).
+
+A richer and more informative experience by adding a prompt theme.
+
+[:fontawesome-solid-book-open: Starship](starship-prompt.md) provides a cross-shell prompt that conveys more information about the current shell (path, time, execution time of commands, etc.).
+
+![Practicalli Custom version of Starship Cappuccin Powerline preset](https://github.com/practicalli/graphic-design/blob/live/os/command-line/starship-cli-preset-catppuccin-custom.png){loading=lazy}
+
 
 ## Aliases
 
-Define aliases to optomise commands and create useful default flags when calling commands
+Define aliases to optimise commands and create useful default flags when calling commands
 
 Use a `shell-aliases` file to define aliases to be used with any command line shell.
 
@@ -52,7 +65,7 @@ Source the shell aliases from the shell configuration files
         ```shell title=".bashrc"
         # Source Shell Aliases
         if [ -f $HOME/.config/shell-aliases ]; then
-            source $HOME/.config/shell-aliases 
+            source $HOME/.config/shell-aliases
         fi
         ```
 

docs/os/shell/index.md renamed to docs/os/command-line/shell/index.md

@@ -4,9 +4,18 @@ Z Shell (zsh) is an advanced shell environment and shell scripting language for
 
 [Wikipedia - Z Shell](https://en.wikipedia.org/wiki/Z_shell){target=_blank .md-button}
 
-## Prezto
 
-## OhmyZsh
+## Community Configurations
+
+Zsh is a very rich shell and a community configuration provides a quick way to use all those features.
+
+- [Prezto](https://github.com/sorin-ionescu/prezto) with sane defaults, aliases, functions, auto completion and prompt themes
+- [OhmyZsh](https://ohmyz.sh/) framework for managing your Zsh configuration with over 300 plugins
+
+If writing your own configuration, consider [Zinit plugin manager](https://github.com/zdharma-continuum/zinit) which installs plugins from their GitHub repository.
+
+Arch Linux has a [guide to configuring Zsh](https://wiki.archlinux.org/title/Zsh).
+
 
 ## Command History
 
@@ -37,7 +46,7 @@ Edit the whole command history as a file, allowing easy removal of unwanted or d
     fc -W; astro "$HISTFILE"; fc -R
     ````
 
-> Replace `astro` with either `emacsclient`, `nvim`, `vim`, nano or any preferred text editor.
+> Replace `astro` with either `emacsclient`, `nvim`, `vim`, `nano` or any preferred text editor.
 
 ## Shell aliases for commands
 

docs/os/shell/zsh.md renamed to docs/os/command-line/shell/zsh.md

@@ -185,6 +185,11 @@ nav:
           - os/command-line/index.md
           - Kitty Terminal: os/command-line/kitty-terminal.md
           - Warp Terminal: os/command-line/warp.md
+          - Shell:
+              - os/command-line/shell/index.md
+              - Bash: os/command-line/shell/bash.md
+              - Zsh: os/command-line/shell/zsh.md
+              - Fish: os/command-line/shell/fish.md
       - Linux:
           - Overview: os/linux/index.md
           - Cron: os/cron.md
@@ -193,11 +198,6 @@ nav:
           - Hyprland: os/linux/hyprland.md
           - Regolith: os/linux/regolith.md
       - MacOSX: os/macosx.md
-      - Shell:
-          - os/shell/index.md
-          - os/shell/bash.md
-          - os/shell/zsh.md
-          - os/shell/fish.md
   - Persistence:
       - persistence/index.md
       - RDBMS: