也许像这样：
if type -p java; then echo found java executable in PATH _java=javaelif [[ -n "$JAVA_HOME" ]] && [[ -x "$JAVA_HOME/bin/java" ]]; then echo found java executable in JAVA_HOME _java="$JAVA_HOME/bin/java"else echo "no java"fiif [[ "$_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 fifi
