How can I check whether Java is available (in the PATH or via JAVA_HOME) from a bash script and make sure the version is at least 1.5?
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Answer
Perhaps something like:
if type -p java; then echo found java executable in PATH _java=java elif [[ -n "$JAVA_HOME" ]] && [[ -x "$JAVA_HOME/bin/java" ]]; then echo found java executable in JAVA_HOME _java="$JAVA_HOME/bin/java" else echo "no java" fi if [[ "$_java" ]]; then version=$("$_java" -version 2>&1 | awk -F '"' '/version/ {print $2}') echo version "$version" if [[ "$version" > "1.5" ]]; then echo version is more than 1.5 else echo version is less than 1.5 fi fi