prerm is in openmpi-bin 1.6.5-9.1+deb8u1.
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 8 9 10 11 | #!/bin/sh
set -e
if [ "$1" != "upgrade" ]; then
update-alternatives --remove mpirun /usr/bin/mpirun.openmpi
fi
exit 0
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