postinst is in fastjar 2:0.98-6.
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 | #! /bin/sh -e
update-alternatives --quiet --install /usr/bin/jar jar /usr/bin/fastjar 100 \
--slave /usr/share/man/man1/jar.1.gz jar.1.gz /usr/share/man/man1/fastjar.1.gz
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