Package all files in the current directory into project.jar

jar -cvfM0 project.jar ./

-c Create jar package
-v Display process information
-f
-M
-0 This is an Arabic numeral, it means only packaging but not compression

Decompress project.jar

jar -xvf project.jar

Extract to the current directory. Note that a game folder will not be created, but all the contents of the jar package will be extracted to the current folder.

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