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After generating all 4 files i.e. POTCAR, POSCAR, INCAR, and KPOINT required for further calculations, i tried to run the command:
[pc@fedora ~]$ cd ~/Downloads/VASP/Calculation/GST/
[pc@fedora GST]$ mpirun -np2 vaspstd

But it's showing:
Open MPI has detected that a parameter given to a command line
option does not match the expected format:

Option: n
Param: vaspstd

This is frequently caused by omitting to provide the parameter
to an option that requires one. Please check the command line and try again.


I am not able for figure it out that what are the changes that required to make in which file or anything else can fix this problem?

Hello!

You probably just forgot the spaces between the arguments, the correct invocation of mpirun should be: Note the spaces between the np argument and the number. Also, the VASP executable has an underscore in its name. If VASP's bin folder is not in your $PATH variable you will also have to give the full path, e.g. Since this is not a bug, I will move the topic to the installation issues forum.

All the best,
Andreas Singraber