环境配置文件:/etc/profile

重新读取环境配置文件:source /etc/profile

java环境:

JAVA_HOME=/opt/jdk1.8.0_172
PATH=/opt/jdk1.8.0_172/bin:$PATH
export JAVA_HOME PATH

maven环境:

export M2_HOME=/opt/apache-maven-3.5.4
export PATH=$PATH:$JAVA_HOME/bin:$M2_HOME/bin

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