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Check for updates
sudo yum update -y
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Install dependencies
sudo yum install -y zsh util-linux-user
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Change to zsh to default
sudo chsh -s /usr/bin/zsh $USER
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Install Oh-My-Zsh (script link here)
sh -c "$(wget https://raw.githubusercontent.com/robbyrussell/oh-my-zsh/master/tools/install.sh -O -)"
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Disconnect and reconnect to the EC2 instance
NOTE: If you want to change the default theme, visit this website.