脚本

    if type -p mvn; then
        echo "maven has been installed."
    else
        cd /home/zenglg
        wget https://dlcdn.apache.org/maven/maven-3/3.9.5/binaries/apache-maven-3.9.5-bin.tar.gz --no-check-certificate
             
        tar vxf apache-maven-3.9.5-bin.tar.gz 
        rm -rf /usr/local/maven3
        mv apache-maven-3.9.5 /usr/local/maven3
            
        #设置mvn的环境变量
        checkMvnExist()
        {
            mvn1=$(grep -n "MAVEN_HOME=.*" /etc/profile | cut -f1 -d':')
                if [ -n "$mvn1" ];then
                    sed -i "${mvn1}d" /etc/profile
                fi
            mvn2=$(grep -n "export MAVEN_HOME" /etc/profile | cut -f1 -d':')
                if [ -n "$mvn2" ];then
                    sed -i "${mvn2}d" /etc/profile
                fi
            mvn3=$(grep -n "export PATH=${PATH}:${MAVEN_HOME}/bin" /etc/profile | cut -f1 -d':')
                if [ -n "$mvn3" ];then
                    sed -i "${mvn3}d" /etc/profile
                fi
        }
        checkMvnExist

        echo "MAVEN_HOME=/usr/local/maven3" >> /etc/profile
        source /etc/profile
        echo "export MAVEN_HOME" >> /etc/profile
        if [[ ${PATH} =~ ${MAVEN_HOME}/bin ]]; then
            echo " MAVEN_HOME has been set"
        else
            echo "export PATH=${PATH}:${MAVEN_HOME}/bin" >> /etc/profile
            echo "setting MAVEN_HOME path successful."
        fi

        #保存刷新
        source /etc/profile
    fi
mvn  -v

安装成功