Here are some examples using which you can get java versions on linux systems:
- java -version
- java -XshowSettings:properties -version
- ls -l $(which java)
- ll /usr/lib/java*
- ls -l /etc/alternatives/java
- dirname $(readlink -f $(which java))
- alternatives --display java
- rpm -qa | grep jdk
- ll /usr/lib/j*
