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/usr/lib/petscdir/3.7.5/x86_64-linux-gnu-complex-debug/bin/petsc-mpiexec.uni is in libpetsc-complex-3.7.5-dbg 3.7.5+dfsg1-4+b1.

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#!/bin/sh

if  [ "$1" = "-hosts" ]; then
    shift 2
fi
if [ "$1" = "-np" -o "$1" = "-n" ]; then
    if [ "$2" = 1 ]; then
        shift 2
    else
        echo "Uniprocessor version of MPI can only use one processor"
        exit 1
    fi
fi

# Execute the program with options
exec "$@"