Terminal Customization Guide

What is Oh My Zsh?

Oh My Zsh is a tool that makes your terminal prettier and more convenient. It provides auto-completion when typing commands, displays with color coding, and lets you see Git information at a glance.

Installing Oh My Zsh

Open Terminal and copy-paste the following command:

sh -c "$(curl -fsSL https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh)"

For questions during installation, enter Y:

• "Do you want to change your default shell to zsh?" → Enter Y

Installing Themes and Plugins

Now that Oh My Zsh is installed, let's install more attractive themes and useful plugins.

Components to Install

• Powerlevel10k: Most popular terminal theme (fast and pretty)
• zsh-autosuggestions: Shows previously typed commands in gray as suggestions
• zsh-syntax-highlighting: Shows correct commands in green, incorrect commands in red

Install Powerlevel10k Theme

Open Terminal and copy-paste the following command:

git clone --depth=1 https://github.com/romkatv/powerlevel10k.git ${ZSH_CUSTOM:-$HOME/.oh-my-zsh/custom}/themes/powerlevel10k

Install zsh-autosuggestions Plugin

git clone https://github.com/zsh-users/zsh-autosuggestions ${ZSH_CUSTOM:-~/.oh-my-zsh/custom}/plugins/zsh-autosuggestions

Install zsh-syntax-highlighting Plugin

git clone https://github.com/zsh-users/zsh-syntax-highlighting.git ${ZSH_CUSTOM:-~/.oh-my-zsh/custom}/plugins/zsh-syntax-highlighting

Update Configuration File

Update settings to activate the installed theme and plugins:

# Change theme
sed -i '' 's/ZSH_THEME=".*"/ZSH_THEME="powerlevel10k\/powerlevel10k"/' ~/.zshrc

# Activate plugins 
sed -i '' 's/plugins=(.*)/plugins=(git docker docker-compose zsh-autosuggestions zsh-syntax-highlighting)/' ~/.zshrc

# Apply settings
source ~/.zshrc

Changing iTerm2 Color Theme

Want to make your terminal even prettier? Try changing the color theme.

Change to Built-in Themes

First, check the themes built into iTerm2:

1. iTerm2 → Settings → Profiles → Colors
2. Click "Color Presets..." dropdown in bottom right
3. Available default themes include:
   • Dark Background (default dark theme)
   • Light Background (light theme)
   • Pastel (Dark Background) (pastel colors)
   • Solarized Dark (popular dark theme)
   • Solarized Light (popular light theme)
   • Tango Dark / Tango Light
4. Click desired theme to apply immediately

Install More Themes

If you don't like the default themes, you can download hundreds of additional themes.

Popular Theme Recommendations

• Dracula: Popular dark purple theme
• Tokyo Night: Modern dark theme
• Gruvbox Dark: Retro theme with warm colors
• Catppuccin: Soft pastel tone theme
• Nord: Minimal theme with cool blue tones

Download and Install Additional Themes

1. Visit iTerm2 Color Schemes website
2. Check theme previews
3. Right-click theme name link → Select "Save Link As..." to download .itermcolors file
4. Return to iTerm2:
   • Settings → Profiles → Colors
   • Click "Color Presets..." → "Import..."
   • Select downloaded .itermcolors file
   • Select imported theme from "Color Presets..." to apply

Powerlevel10k Configuration Wizard

When you restart the terminal, the Powerlevel10k configuration wizard starts automatically.

MesloLGS NF Font Installation Notice

Before the configuration wizard starts, a screen appears recommending MesloLGS NF font installation:

Configuration Wizard Progress

Recommended Settings (For Beginners)

It's recommended to select the following for each question:

• Diamond → y (y if you see diamond icon)
• Lock → y (y if you see lock icon)
• Debian → y (y if you see Debian logo)
• Style → 3 (Rainbow) (most popular colorful style)
• Character Set → 1 (Unicode) (use Unicode characters)
• Prompt Style → 3 (Pure) (clean 2-line style)
• Transient Prompt → n (keep default)
• Instant Prompt → 1 (Verbose) (fast start)

Change Back to Korean Font

After Powerlevel10k configuration, iTerm2 font will be changed to MesloLGS NF. To properly display Korean, you need to change back to D2Coding Nerd Font:

1. iTerm2 → Settings (or Cmd + ,)
2. Select Profiles → Text tab
3. Confirm current font is "MesloLGS NF" in Font section
4. Click Change Font
5. Select "D2CodingLigature Nerd Font"
6. Size 14pt recommended

Verify Installation

Let's check if everything is installed correctly.

Open Terminal and copy-paste the following command:

echo $ZSH_THEME  # Should output powerlevel10k/powerlevel10k
echo $SHELL      # Should output /bin/zsh

Verification Points for Successful Installation

1. Terminal Prompt: Shows Git branch name, folder icons, etc.
2. Auto-completion: Gray text suggestions appear when typing commands
3. Syntax Highlighting: Correct commands in green, incorrect commands in red
4. Icons: Nerd Font icons display properly without breaking

Additional Tips

Useful Oh My Zsh Aliases

Convenient shortcut commands provided by Oh My Zsh:

• ll - ls -l (detailed file list)
• la - ls -la (list including hidden files)
• .. - cd .. (go to parent folder)
• ... - cd ../.. (go up two levels)
• gst - git status (check Git status)
• gaa - git add --all (add all changes)
• gcmsg - git commit -m (commit with message)

Powerlevel10k Advanced Settings

If you want more settings, you can edit the ~/.p10k.zsh file:

# Edit configuration file
code ~/.p10k.zsh  # Open with VS Code

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