zsh z shell getting started on mac os

Mac OS Catalina comes with zsh installed.

If not installed on older versions, run this brew install to install zsh.

brew install zsh

Confirm zsh installation.

zsh --version

Check the default shell.

echo $SHELL

Create a global alias function in zsh.
a. Create a the file ~/.zshenv at your home root directory if it doesn’t already exist.
b. Add following to hellozsh function into this file ~/.zshenv

hellozsh() {
  echo 'hello zsh!'
  zsh --version
  echo $SHELL
}

c. Run the following command to initialize the file ~/.zshenv

source ~/.zshenv

d. Run the function hellzsh defined in ~/.zshenv

hellozsh

Create a zsh script file and run it.
a. Create a file called helloworld.zsh
b. Add the following in the file created above.

#!/bin/zsh
echo "Hello World!"

c. Make this file executable.

chmod +x helloworld.zsh

d. Run the zshell script helloworld.zsh

./helloworld.zsh