jenkins中shell脚本中使用构建参数化Groovy变量的四种方式:
以字符变量为例：

流水线代码：

pipeline {
    agent {
        //label "${server}"
        label "${28}"
    }

    stages {
        stage('Hello') {
            steps {
                echo 'Hello World'
                echo "${28}"
                echo "${character_argument}"
                
                echo "--------------------------"
                // 这个报错
                //echo ${character_argument} 
                // 这个可以输出变量
                echo "${character_argument}"
                //# 下面这三个不可以，输出的是${character_argument}本身
                echo "\${character_argument}"
                echo '${character_argument}'
                echo '\${character_argument}'
                echo "--------------------------"
            }
        }
        stage('shell') {
            steps{
                script {
                    sh"""
                        pwd
                        # shell 脚本中引用 Groovy变量的四种方式
                        echo ${character_argument}
                        echo "${character_argument}"
                        echo "\${character_argument}"
                        echo '${character_argument}'
                        # 下面这个不可以，输出的是${character_argument}本身
                        echo '\${character_argument}'
                    """
                }                
            }
        }
    }
}

直接运行：

Console Output：

Started by user 昌显瑞
[Pipeline] Start of Pipeline
[Pipeline] node
Running on xxx.xxx.xx.xx in /home/jenkins/program/jenkins/workspace/xxxxxx_test
[Pipeline] {
[Pipeline] stage
[Pipeline] { (Hello)
[Pipeline] echo
Hello World
[Pipeline] echo
28
[Pipeline] echo
default_argument
[Pipeline] echo
--------------------------
[Pipeline] echo
default_argument
[Pipeline] echo
${character_argument}
[Pipeline] echo
${character_argument}
[Pipeline] echo
${character_argument}
[Pipeline] echo
--------------------------
[Pipeline] }
[Pipeline] // stage
[Pipeline] stage
[Pipeline] { (shell)
[Pipeline] script
[Pipeline] {
[Pipeline] sh
+ pwd
/home/jenkins/program/jenkins/workspace/middle_nMedia_test
+ echo default_argument
default_argument
+ echo default_argument
default_argument
+ echo default_argument
default_argument
+ echo default_argument
default_argument
+ echo ${character_argument}
${character_argument}
[Pipeline] }
[Pipeline] // script
[Pipeline] }
[Pipeline] // stage
[Pipeline] }
[Pipeline] // node
[Pipeline] End of Pipeline
Finished: SUCCESS