Set zsh to Linux default shell

Check current default shell

echo $SHELL

Linux default shell is usually /bin/bash

Install zsh

CentOS:

yum -y install zsh
# or
#dnf -y install zsh
yum -y install util-linux-user

Ubuntu:

sudo apt install zsh

Configure default shell

Set default shell for root

sudo chsh -s /bin/zsh

Set default shell for specific user

sudo chsh -s /bin/zsh <username>

Install git

We need git environment to either install automatically or manually, run the following command

# CentOS
yum -y instal git
# Ubuntu
sudo apt install git

Install oh-my-zsh

oh-my-zsh is a plug-in/theme manager under the zsh shell.

Automatically install oh-my-zsh

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

Cloning Oh My Zsh...
Cloning into '/root/.oh-my-zsh'...
remote: Enumerating objects: 1158, done.
remote: Counting objects: 100% (1158/1158), done.
remote: Compressing objects: 100% (1127/1127), done.
remote: Total 1158 (delta 20), reused 1059 (delta 15), pack-reused 0
Receiving objects: 100% (1158/1158), 778.08 KiB | 218.00 KiB/s, done.
Resolving deltas: 100% (20/20), done.

Looking for an existing zsh config...
Using the Oh My Zsh template file and adding it to ~/.zshrc.

Time to change your default shell to zsh:
Do you want to change your default shell to zsh? [Y/n] Y
Changing the shell...
Changing shell for root.
Shell changed.
Shell successfully changed to '/usr/bin/zsh'.

         __                                     __
  ____  / /_     ____ ___  __  __   ____  _____/ /_
 / __ \/ __ \   / __ `__ \/ / / /  /_  / / ___/ __ \
/ /_/ / / / /  / / / / / / /_/ /    / /_(__) / / /
\____/_/ /_/  /_/ /_/ /_/\__, /    /___/____/_/ /_/
                        /____/                       ....is now installed!


Before you scream Oh My Zsh! please look over the ~/.zshrc file to select plugins, themes, and options.

Install oh-my-zsh manually

Download source code

git clone --depth=1 https://github.com/ohmyzsh/ohmyzsh.git ~/.oh-my-zsh

Copy configuration file

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

ZSH_THEME indicates the current theme (sysin). You can change it to "ys" for example. Other themes should refer to the official wiki.

# If you come from bash you might have to change your $PATH.
# export PATH=$HOME/bin:/usr/local/bin:$PATH

# Path to your oh-my-zsh installation.
export ZSH="/root/.oh-my-zsh"

# Set name of the theme to load --- if set to "random", it will
# load a random theme each time oh-my-zsh is loaded, in which case,
# to know which specific one was loaded, run: echo $RANDOM_THEME
# See https://github.com/ohmyzsh/ohmyzsh/wiki/Themes
#ZSH_THEME="robbyrussell"
ZSH_THEME="ys"

Notes: theme-related files are located ~/.oh-my-zsh/themes directory.

Plug-in

Built-in autocompletion

The built-in oh-my-zsh command auto-completion function is as follows:

Automatically list directories
Enter cd and press the tab key, the directory will be listed automatically, and you can switch by pressing tab.
Automatic directory name abbreviation completion
To access the long path of /usr/local/bin, just type cd /u/l/b then press the tab key to autocomplete.
Automatic capitalization correction
To access the Desktop folder, just cd de press the tab key for autocompletion, or just type cat rea for autocorrect completion to view README.md.
Auto command completion
Type kubectl and press the tab key to see available commands.
Autocomplete command parameters
Type kill and press the tab key to automatically display the process id.

Tips:

You can ignore the cd command, enter .. or ... and the current directory name to jump.

zsh-autosuggestions

It suggests commands as you type based on history and completions. Press the → key to accept the suggestion.

Install

git clone --depth=1 https://github.com/zsh-users/zsh-autosuggestions.git ${ZSH_CUSTOM:-${ZSH:-~/.oh-my-zsh}/custom}/plugins/zsh-autosuggestions

Insert zsh-autosuggestions into the plugins=(git) line in the ~/.zshrc file.

plugins=(
    git
    # other plugins...
    zsh-autosuggestions
)

This package provides syntax highlighting for the shell zsh. It enables highlighting of commands whilst they are typed at a zsh prompt into an interactive terminal. This helps in reviewing commands before running them, particularly in catching syntax errors.