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As follows:

$ preparePar -help

Usage: preparePar [OPTIONS]
options:
  -case <dir>       specify alternate case directory, default is the cwd
  -decomposeParDict <file>
                    read decomposePar dictionary from specified location
  -fileHandler <handler>
                    override the file handler type
  -noFunctionObjects
                    do not execute function objects
  -parallel         run in parallel
  -roots <(dir1 .. dirN)>
                    slave root directories for distributed running
  -doc              display application documentation in browser
  -doc-source       display source code in browser
  -help             print usage information and exit
  -help-full        print full usage information and exit

Using: OpenFOAM-v1712 (see www.OpenFOAM.com)
Build: v1712
Arch:  "LSB;label=32;scalar=64"


$ preparePar -decomposeParDict system/decomposeParDictMesher
...

--> FOAM FATAL ERROR:
cannot find file "/home/ram/projects/consistentOn-b_1nOC/meshTest/system/decomposeParDict"

    From function virtual Foam::autoPtr<Foam::ISstream> Foam::fileOperations::uncollatedFileOperation::readStream(Foam::regIOobject&, const Foam::fileName&, const Foam::word&, bool) const
    in file global/fileOperations/uncollatedFileOperation/uncollatedFileOperation.C at line 502.

FOAM exiting