/var/lib/dpkg/alternatives
Edit: /var/lib/dpkg/alternatives/mpirun (271B)
auto
/usr/bin/mpirun
mpiexec
/usr/bin/mpiexec
mpiexec.1.gz
/usr/share/man/man1/mpiexec.1.gz
mpirun.1.gz
/usr/share/man/man1/mpirun.1.gz
/usr/bin/mpirun.openmpi
50
/usr/bin/mpiexec.openmpi
/usr/share/man/man1/mpiexec.openmpi.1.gz
/usr/share/man/man1/mpirun.openmpi.1.gz