Install SteamCMD

First you need to create an user that will manage the steamcmd utilities

sudo useradd -m steam
sudo passwd steam
sudo usermod -a -G steam sudo

then go into the steam home folder

sudo -u steam -s
cd

to install the package you need to add the repository and install some dependencies

sudo add-apt-repository multiverse; sudo dpkg --add-architecture i386; sudo apt update
sudo apt install steamcmd

for the first start of the app you need to run it with the full path

/usr/games/steamcmd

after that add the path to your $PATH

export PATH="$PATH:/usr/games"

when it's done you can run the steamcmd just by call it and you will get the steamcmd prompt

steamcmd
steamcmd>