/usr/share/gromacs/shell-specific/gmx-completion-mdrun_mpi.openmpi.bash is in gromacs-openmpi 2016.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | complete -o nospace -F _gmx_mdrun_compl mdrun_mpi.openmpi
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