Question

I’m trying to develop a bash build script for a Java project that will be run on Ubuntu and Fedora. Ubuntu uses the gcj compiler while Fedora uses IcedTea.

Both report their errors and warning in slightly different ways, and I want to ignore the warnings (I know, not generally a good idea, but some of the warnings are simply idiotic).

For gcj, I want to run:

javac *.java 2>&1 | grep -A 4 "error:"

but for IcedTea, I want to run:

javac *.java 2>&1 | grep -A 4 "error:\|errors\|.java:"

I’m still new to bash, so how would I write an if statement that would run one versus the other based upon the javac version?

Answer 1

Assuming your java and javac binaries match, and that icedtea is the special case.

#!/bin/bash

ERROR="error:"

java -version 2>&1 | grep -i icedtea > /dev/null
if [ $? -eq 0 ]; then
   ERROR="error:\|errors\|.java:"
fi

javac *.java 2>&1 | grep -A 4 $ERROR

On my system, icedtea and sun have the same output for “javac -version”, but not for “java -version”.