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The syntax for pkg_patch usage is:

usage:
        ./pkg_patch -c [-b] package_file_1 package_file_2 patch_file
        ./pkg_patch -a patch_file
        ./pkg_patch -m [-b] [-r url_repo] package_dir_1 package_dir_2 patch_dir
        ./pkg_patch -u [url]

The target usage scenario for the end-user is to use the “-u” flag to pkg_patch in order to update the currently running system.