step 1. which/whereis得到程序的可執行路徑, 以查看jdk安裝路徑爲例:
which java
得到 /usr/bin/java
step 2. 利用ls的屬性之行如下:
ls -lrt /usr/bin/java
輸出:
lrwxrwxrwx. 1 root root 22 Apr 13 05:30 /usr/bin/java -> /etc/alternatives/java
step3. 輸入:
ls -lrt /etc/alternatives/java
輸出:
lrwxrwxrwx. 1 root root 35 Apr 13 05:30 /etc/alternatives/java -> /usr/java/jdk1.8.0_121/jre/bin/java
/usr/java/jdk1.8.0_121/jre/bin/java 即爲jdk的安裝路徑。