2：which java

首先要申明一下which java是定位不到安裝路徑的。which java定位到的是java程式的執行路徑。網上的資料都是人云亦云，完全不去思考。那麼怎麼定位到java的安裝路徑呢？下面我們來看看例子吧,如下所示：

[[email protected] ~]# java -version
 
java version "1.7.0_65"
 
OpenJDK Runtime Environment (rhel-2.5.1.2.el6_5-x86_64 u65-b17)
 
OpenJDK 64-Bit Server VM (build 24.65-b04, mixed mode)
 
[

[email protected] ~]# which java
 
/usr/bin/java
 
[[email protected] ~]# ls -lrt /usr/bin/java
 
lrwxrwxrwx. 1 root root 22 Aug 17 15:12 /usr/bin/java -> /etc/alternatives/java
 
[[email protected] ~]# ls -lrt /etc/alternatives/java
 
lrwxrwxrwx. 1 root root 46 Aug 17 15:12 /etc/alternatives/java -> /usr/lib/jvm/jre-1.7.0-openjdk.x86_64/bin/java
 
[

[email protected] ~]# 
 
[[email protected] ~]# cd /usr/lib/jvm
 
[[email protected] jvm]# ls
 
java-1.6.0-openjdk-1.6.0.0.x86_64 java-1.7.0-openjdk-1.7.0.65.x86_64 jre jre-1.6.0 jre-1.6.0-openjdk.x86_64 jre-1.7.0 jre-1.7.0-openjdk.x86_64 jre-openjdk