Here, -c specifies the input ZIP file, and -o specifies the output package file.
To transform a ZIP archive into a macOS installer package, developers typically use built-in terminal commands or dedicated third-party software: Command Line Method Package a command line script in a Mac OS X pkg zip2pkg
is a niche utility primarily known as a mode within the Wallpaper-Engine-Pkg-to-Zip tool created by developer TheRioMiner Here, -c specifies the input ZIP file, and