You can install the latest version with one line:
curl -o install-add-alias.sh https://raw.githubusercontent.com/delivey/add-alias/main/install.sh && chmod +x install-add-alias.sh && ./install-add-alias.sh && rm install-add-alias.sh
Or multiple:
curl -o install-add-alias.sh https://raw.githubusercontent.com/delivey/add-alias/main/install.sh
chmod +x install-add-alias.sh
./install-add-alias.sh
rm install-add-alias.sh
add-alias <x> <y>
is the alias, is the command, for example
add-alias ip ifconfig