postinst is in jarwrapper 0.54ubuntu1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | #!/bin/sh --
set -e
if [ "$1" = configure ] && which update-binfmts >/dev/null 2>&1; then
update-binfmts --import jarwrapper
fi
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