Why Zsh and Oh‑My‑Zsh Make Linux Shells Look Stunning

Linux shell landscape

Common shells include sh, bash, csh and others. The installed shells can be listed with cat /etc/shells. An example output is shown in the image below.

Zsh overview

Zsh is a powerful shell that is included in most Linux distributions and can be installed via package managers such as apt‑get, yum or urpmi.

Out‑of‑the‑box programmable command‑line completion.

Shared command history across all user shells.

Extended globbing that can replace external find expansions.

Improved variable and array handling.

Multi‑line command editing in the buffer.

Compatibility modes (e.g., masquerading as Bourne shell).

Customizable prompts, including right‑hand information and auto‑hide for long commands.

Loadable modules for TCP/Unix‑domain sockets, FTP client, and extended math functions.

Fully customizable.

Oh‑My‑Zsh

Oh‑My‑Zsh is a community framework built on top of Zsh that provides plugin management, theme customization, and enhanced completion effects. Repository: https://github.com/robbyrussell/oh-my-zsh

Installation steps

Install Zsh

sudo apt-get install zsh

Configure Zsh

A ready‑made .zshrc file can be copied to the user’s home directory. Existing Bash configuration files (e.g., ~/.bash_profile, ~/.profile) can also be copied into ~/.zshrc because Zsh is Bash‑compatible.

Set Zsh as the default shell

sudo usermod -s /bin/zsh username

or

chsh -s /bin/zsh

chsh -s `which zsh`

To revert to Bash:

chsh -s /bin/bash

Install Oh‑My‑Zsh

git clone git://github.com/robbyrussell/oh-my-zsh.git ~/.oh-my-zsh

Backup the existing .zshrc and replace it with the template:

cp ~/.zshrc ~/.zshrc.orig
cp ~/.oh-my-zsh/templates/zshrc.zsh-template ~/.zshrc

Or run the installer script directly:

sh -c "$(curl -fsSL https://raw.githubusercontent.com/robbyrussell/oh-my-zsh/master/tools/install.sh)"

sh -c "$(wget https://raw.githubusercontent.com/robbyrussell/oh-my-zsh/master/tools/install.sh -O -)"

Theme configuration

Set a specific theme by editing the ZSH_THEME variable in ~/.zshrc: ZSH_THEME="agnoster" Enable random theme selection:

ZSH_THEME="random"

Plugin configuration

Edit the plugins array in ~/.zshrc to enable desired plugins, for example:

plugins=(git bundler osx rake ruby)

Update management

Disable the weekly update prompt: disable_update_prompt=true Disable automatic updates entirely: disable_auto_update=true Manually upgrade Oh‑My‑Zsh:

upgrade_oh_my_zsh

Uninstall Oh‑My‑Zsh

uninstall_oh_my_zsh zsh