postinst is in pvm 3.4.5-12.6ubuntu1.
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 | #!/bin/sh
set -e
update-alternatives --install /usr/lib/pvm3/bin/rsh pvm-rsh /usr/bin/rsh 10
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