https://blog.csdn.net/dannistang/article/details/82906867
使用echo查看文件位置的话，前提是配置安装了环境变量java_home，否则是找不到的文件路径位置的
[root@Redhat6 bin]# echo $JAVA_HOME
[root@Redhat6 bin]# java -version
java version "1.7.0_131"
OpenJDK Runtime Environment (rhel-2.6.9.0.el6_8-x86_64 u131-b00)
OpenJDK 64-Bit Server VM (build 24.131-b00, mixed mode)
[root@Redhat6 bin]#
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使用which的话，是能找到java的程序执行路径，要一步一步的去找到java的安装路径
[root@Redhat6 ~]# which java
/usr/bin/java
[root@Redhat6 java]# ls -lrt /usr/bin/java
lrwxrwxrwx. 1 root root 22 Sep 7 06:03 /usr/bin/java -> /etc/alternatives/java
[root@Redhat6 java]# ls -lrt /etc/alternatives/java
lrwxrwxrwx. 1 root root 46 Sep 7 06:03 /etc/alternatives/java -> /usr/lib/jvm/jre-1.7.0-openjdk.x86_64/bin/java
[root@Redhat6 java]# cd /usr/lib/jvm
[root@Redhat6 jvm]# ls
java jre
java-1.5.0-gcj-1.5.0.0 jre-1.5.0
java-1.6.0 jre-1.5.0-gcj
java-1.6.0-openjdk-1.6.0.41.x86_64 jre-1.6.0
java-1.6.0-openjdk.x86_64 jre-1.6.0-openjdk.x86_64
java-1.7.0 jre-1.7.0
java-1.7.0-openjdk-1.7.0.131.x86_64 jre-1.7.0-openjdk.x86_64
java-1.7.0-openjdk.x86_64 jre-gcj
java-openjdk jre-openjdk
[root@Redhat6 jvm]# cd java
[root@Redhat6 java]# ll
total 216
-r--r--r--. 1 root root 1503 Feb 7 2017 ASSEMBLY_EXCEPTION
drwxr-xr-x. 2 root root 4096 Sep 14 17:50 bin
drwxr-xr-x. 3 root root 4096 Sep 7 06:10 include
drwxr-xr-x. 4 root root 4096 Sep 7 06:02 jre
drwxr-xr-x. 3 root root 4096 Sep 14 17:50 lib
-r--r--r--. 1 root root 19263 Feb 7 2017 LICENSE
drwxr-xr-x. 2 root root 4096 Sep 7 06:10 tapset
-r--r--r--. 1 root root 172264 Feb 7 2017 THIRD_PARTY_README
[root@Redhat6 java]# cd bin
[root@Redhat6 java]# pwd
/usr/lib/jvm/java
[root@Redhat6 bin]# ls
appletviewer javac jdb jstack policytool tnameserv
apt javadoc jhat jstat rmic unpack200
extcheck javah jinfo jstatd rmid wsgen
idlj javap jmap keytool rmiregistry wsimport
jar java-rmi.cgi jps native2ascii schemagen xjc
jarsigner jcmd jrunscript orbd serialver
java jconsole jsadebugd pack200 servertool
[root@Redhat6 bin]#
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一步一步就能找到java文件的安装路径，然后再去配置一下java_home的环境变量就可以了