JAVA_HOME配置

echo "JAVA_HOME=$(readlink -f /usr/bin/java | sed "s:bin/java::")" | tee -a /etc/profile
source /etc/profile
#readlink -f 读取软连接的原路径
#sed "s:bin/java::" 把bin/java去掉
#tee -a /etc/profile tee读取标准输入数据 然后追写到/etc/profile