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In order to use “Oh My Zsh” you will need to have the zsh shell installed and enabled as your default shell.

sudo apt install zsh

Determine the path for zsh

which zsh

Next change your shell to zsh assuming here that the path we got above was /usr/bin/zsh

chsh -s /usr/bin/zsh

Now log out and into your system again for changes to take effect.

Unlike other shells zsh comes with a configuration menu the first time you launch it. Select the following.

1: Continue to main menu
1: Again configure settings for history. And here press 1 2 and 3

Press “0” remember the changes, and once back on the main menu and here press “0” again to save the configuration.

Oh My Zsh can be installed using either curl or wget

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

sh -c "$(wget https://raw.github.com/ohmyzsh/ohmyzsh/master/tools/install.sh -O -)"

I suggest adding a few plugins.

vi .zshrc

Find this line:

plugins=(

And add the following plugins.

git
colored-man-pages

All plugins listed on the plugins Github page are pre-installed with Oh-My-Zsh at ~/.oh-my-zsh/plugins. Custom plugins can be installed at ~/.oh-my-zsh/custom/plugins. To use a plugin, you can simply add it to the plugins list in your ~/.zshrc file. Add wisely, as too many plugins slow down shell startup. Leave a blank between each plugin.

Pro Tip: Another great plugin is syntax highlighting and zsh-autosuggestions theese plugins are not preinstalled with Oh-My-Zsh.

cd ~/.oh-my-zsh/custom/plugins
git clone https://github.com/zsh-users/zsh-syntax-highlighting

cd ~/.oh-my-zsh/custom/plugins
git clone https://github.com/zsh-users/zsh-autosuggestions

Then enable the pluings by adding them to the .zshrc file.

vi .zshrc

Find this line:

plugins=(

And add the following plugins.

zsh-syntax-highlighting
zsh-autosuggestions

For this we are going to use the default theme which is called “robbyrussell.zsh-theme”

vi ~/.oh-my-zsh/themes/robbyrussell.zsh-theme

We are looking to change the first line. Look for %c and change it to either:

• %~ (For shorten home dir i.e ~/.oh-my-zsh/themes) or
• %d (For long home dir i.e /home/username.oh-my-zsh/themes)

Once you done the initial configuration you will not be asked again. You can however run it manual like this.

autoload -Uz zsh-newuser-install
zsh-newuser-install -f

In this example we will change the default theme to agnoster. The agnoster theme requires a special font so let's install that first.

sudo apt install fonts-powerline

Next change to the new theme.

vi ~/.zshrc

Change the following:

ZSH_THEME="robbyrussell"

To:

ZSH_THEME="agnoster"

Close and reopen your terminal.

Open a terminal at type

uninstall_oh_my_zsh

Open a terminal and type

chsh -s $(which "bash")
apt --purge remove zsh

If you installed zsh as root you also need to remove zsh like this.

chsh -s $(which "bash")
sudo apt --purge remove zsh

Now log out and in to your system, in some extreme cases you may need to reboot.