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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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If you want to know which version of Java was used to compile the class, you can use javap , available in the JRE and JDK. It reads your class bytecode and tells you the version. javap -v out/com/kineolyan/tzio/diffs/Main.
To find my bash version, run any one of the following command: Get the version of bash I am running, type: echo "${BASH_VERSION}" Check my bash version on Linux by running: bash --version. To display bash shell version press Ctrl + x Ctrl + v.
1. Open command prompt and enter “java –version”. If installed version number is displayed.
Perhaps something like:
if type -p java; then echo found java executable in PATH _java=java elif [[ -n "$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 If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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