The Z shell (zsh) is a Unix shell [...]. Zsh can be thought of as an extended Bourne shell with a large number of improvements, including some features of bash, ksh, and tcsh.
Read more about ZSH at An Introduction to the Z Shell.
Choose one of the following options.
Some Linux systems come preloaded with zsh. You can check if it exists as well as its version by writing zsh --version in a terminal window. In case this zsh version is ok for you, you're done now!
Determine on which Linux distribution your system is based on. See List of Linux distributions – Wikipedia for a list. Most Linux systems – including Ubuntu – are Debian-based.
Open a terminal window. Copy & paste the following into the terminal window and hit Return. You may be prompted to enter your password.
sudo apt update
sudo apt upgrade
sudo apt install zshYou can use zsh now.
Open a terminal. Copy & paste the following into the terminal window and hit Return. You may be prompted to enter your password.
sudo yum upgrade
sudo yum install zshOpen a terminal. Copy & paste the following into the terminal window and hit Return. You may be prompted to enter your password.
sudo zypper upgrade
sudo zypper install zshYou can use zsh now.
How to install the zsh shell in Linux; how to set it as a default login shell
OS X comes preloaded with zsh. You can check its version by writing zsh --version in a terminal window. In case this zsh version is ok for you, you're done now!
If you want the latest and greatest, use Homebrew: Proceed with the following steps to install a recent version.
Homebrew [...] simplifies the installation of software on the Mac OS X operating system.
Copy & paste the following into the terminal window and hit Return.
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
brew doctorYou will be requested to install the Command Line Developer Tools from Apple. Confirm by clicking Install. After the installation finished, continue installing Homebrew by hitting Return again.
Copy & paste the following into the terminal window and hit Return.
brew install zshYou can use zsh now.
To set zsh as your default shell, execute the following.
sudo sh -c "echo $(which zsh) >> /etc/shells" && chsh -s $(which zsh)This is quite complicated by now. You may have a look at Babun.