Bash script to check Java version

• to check the java version:

  java -version 2>&1 | grep "java version" | awk '{print $3}' | tr -d \"
  

  
  or
  
  

  java -version 2>&1 | grep "java version" | awk '{print $3}' | sed -e "s/\"//g"
  

• to check if the java version is greater than 1.5 (jdk 5), use the script below:
  

  #!/bin/bash
  VER=`java -version 2>&1 | grep "java version" | awk '{print $3}' | tr -d \" | awk '{split($0, array, ".")} END{print array[2]}'`
  if [[ $VER ge 5 ]]; then
      echo "Java version is greater than 1.5."
  else
      echo "Java version is lower than 1.5."
  fi