linux环境变量

vi /root/.bashrc

export JAVA_HOME=/usr/local/jdk

export PATH=$PATH:$JAVA_HOME/bin
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar


export HADOOP_INSTALL=/usr/local/hadoop
export PATH=$PATH:$HADOOP_INSTALL/bin:$HADOOP_INSTALL/sbin