linux 获取java_home

用命令 whereis java就可以看到了
eg:
root@tiger:/home/lidongbo/soft/hadoop-0.20.203.0# whereis java
java: /usr/bin/java /usr/share/java /usr/share/man/man1/java.1.gz

如果仅仅想知道java执行路径在那里的话 用which java就可以了
eg:
root@tiger:/home/lidongbo/soft/hadoop-0.20.203.0# which java
/usr/bin/java
root@tiger:/home/lidongbo/soft/hadoop-0.20.203.0#



/usr/lib/jvm/java-1.6.0-openjdk