prerm is in mpich-shmem-bin 1.2.7-10ubuntu1.
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 != "upgrade" ] ; then
update-alternatives --remove mpirun /usr/bin/mpirun.mpich-shmem
fi;
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