Question

alternate –config is updated

java -version works

How do i verify if java is installed if java is installed and what version. What is the correct way.

Answer 1

I think this is what you want:

#!/bin/bash
if [ -x /usr/bin/java ] ; then
        java -version 2>&1 | head -1 | awk -F '"' '{print $2}'
else
        exit
fi

OUTPUT (on my linux box):

1.6.0_18

check whether the java executable is present. if yes, then print the version.