脚本如下：

#!/bin/bash

# Function to install Zabbix Agent 2 on RHEL 6
install_zabbix_rhel6() {
  # Check if the Zabbix repository is already installed
  if rpm -q zabbix-release &>/dev/null; then
    echo "Zabbix repository is already installed."
  else
    # Install Zabbix repository
    rpm -Uvh https://repo.zabbix.com/zabbix/6.0/rhel/6/x86_64/zabbix-release-6.0-4.el6.noarch.rpm
    if [ $? -eq 0 ]; then
      echo "Zabbix repository installed successfully."
    else
      echo "Error installing Zabbix repository. Exiting."
      exit 1
    fi
  fi

  # Check if Zabbix Agent 2 is already installed
  if rpm -q zabbix-agent2 &>/dev/null; then
    echo "Zabbix Agent 2 is already installed."
  else
    # Install Zabbix Agent 2
    yum clean all
    yum install zabbix-agent2 zabbix-agent2-plugin-* -y
    if [ $? -eq 0 ]; then
      echo "Zabbix Agent 2 installed successfully."
    else
      echo "Error installing Zabbix Agent 2. Exiting."
      exit 1
    fi
  fi
  # Modify Zabbix Agent 2 configuration
  read -p "Enter the desired hostname for Zabbix Agent: " hostname
  sed -i "s/^Server=.*/Server=10.99.50.112/" /etc/zabbix/zabbix_agent2.conf
  sed -i "s/^ServerActive=.*/ServerActive=10.99.50.112/" /etc/zabbix/zabbix_agent2.conf
  sed -i "s/^Hostname=.*/Hostname=$hostname/" /etc/zabbix/zabbix_agent2.conf
  # Enable and start Zabbix Agent 2
  service zabbix-agent2 restart
  chkconfig --level 35 zabbix-agent2 on
}

# Function to install Zabbix Agent 2 on RHEL 7
install_zabbix_rhel7() {
  echo "Installing Zabbix Agent 2 on RHEL 7"
  # Check if Zabbix repository is already installed
  if rpm -q zabbix-release &>/dev/null; then
    echo "Zabbix repository is already installed."
  else
    # Install Zabbix repository
    rpm -Uvh https://repo.zabbix.com/zabbix/6.0/rhel/7/x86_64/zabbix-release-6.0-4.el7.noarch.rpm
    if [ $? -eq 0 ]; then
      echo "Zabbix repository installed successfully."
    else
      echo "Error installing Zabbix repository. Exiting."
      exit 1
    fi
  fi

  # Check if Zabbix Agent 2 is already installed
  if rpm -q zabbix-agent2 &>/dev/null; then
    echo "Zabbix Agent 2 is already installed."
  else
    # Install Zabbix Agent 2
    yum clean all
    yum install zabbix-agent2 zabbix-agent2-plugin-* -y
    if [ $? -eq 0 ]; then
      echo "Zabbix Agent 2 installed successfully."
    else
      echo "Error installing Zabbix Agent 2. Exiting."
      exit 1
    fi
  fi
  # Modify Zabbix Agent 2 configuration
  read -p "Enter the desired hostname for Zabbix Agent: " hostname
  sed -i "s/^Server=.*/Server=10.99.50.112/" /etc/zabbix/zabbix_agent2.conf
  sed -i "s/^ServerActive=.*/ServerActive=10.99.50.112/" /etc/zabbix/zabbix_agent2.conf
  sed -i "s/^Hostname=.*/Hostname=$hostname/" /etc/zabbix/zabbix_agent2.conf
  # Enable and start Zabbix Agent 2
  systemctl enable zabbix-agent2
  systemctl start zabbix-agent2
}

# Function to install Zabbix Agent 2 on RHEL 8
install_zabbix_rhel8() {
  echo "Installing Zabbix Agent 2 on RHEL 8"
  # Check if the Zabbix repository is already installed
  if rpm -q zabbix-release &>/dev/null; then
    echo "Zabbix repository is already installed."
  else
    # Install Zabbix repository
    rpm -Uvh https://repo.zabbix.com/zabbix/6.0/rhel/8/x86_64/zabbix-release-6.0-4.el8.noarch.rpm
    if [ $? -eq 0 ]; then
      echo "Zabbix repository installed successfully."
    else
      echo "Error installing Zabbix repository. Exiting."
      exit 1
    fi
  fi

  # Check if Zabbix Agent 2 is already installed
  if rpm -q zabbix-agent2 &>/dev/null; then
    echo "Zabbix Agent 2 is already installed."
  else
    # Install Zabbix Agent 2
    dnf clean all
    dnf install zabbix-agent2 zabbix-agent2-plugin-* -y
    if [ $? -eq 0 ]; then
      echo "Zabbix Agent 2 installed successfully."
    else
      echo "Error installing Zabbix Agent 2. Exiting."
      exit 1
    fi
  fi
  # Modify Zabbix Agent 2 configuration
  read -p "Enter the desired hostname for Zabbix Agent: " hostname
  sed -i "s/^Server=.*/Server=10.99.50.112/" /etc/zabbix/zabbix_agent2.conf
  sed -i "s/^ServerActive=.*/ServerActive=10.99.50.112/" /etc/zabbix/zabbix_agent2.conf
  sed -i "s/^Hostname=.*/Hostname=$hostname/" /etc/zabbix/zabbix_agent2.conf
  # Enable and start Zabbix Agent 2
  systemctl enable zabbix-agent2
  systemctl start zabbix-agent2
}

# Install Zabbix repository based on the selected OS version
echo "Select the operating system version:"
options=("RHEL 6" "RHEL 7" "RHEL 8" "Quit")
select opt in "${options[@]}"; do
  case "$opt" in
    "RHEL 6")
      install_zabbix_rhel6
      break
      ;;
    "RHEL 7")
      install_zabbix_rhel7
      break
      ;;
    "RHEL 8")
      install_zabbix_rhel8
      break
      ;;
    "Quit")
      echo "Exiting."
      exit 0
      ;;
    *)
      echo "Invalid option. Please select a valid option."
      ;;
  esac
done  


echo "Zabbix Agent 2 installation and configuration complete."