Because the -p option specifies that the unzip command should write its output to standard output rather than to an actual file, there is no need to clean up any files. Brute Force jar Approach ...

and I know a jar file uses the zip format. But how does one create a jar file without a manifest file. (I don't mean creating a zip file and renaming it jar. That'd be cheating). As would creating ...

Sun has extended the zip format’s use with various conventions so that you can pack Java classes into an archive file. With the addition of the JAR manifest file, the Java runtime can easily ...

Java applications and libraries can contain hundreds of different files, including compiled Java source code, a manifest file, XML-based configuration data, JSON-based data files, images, sound clips ...