Combining two data files

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Dear LAMMPS Users,

I have two LAMMPS data files from two simulations, both of different box sizes and forcefields and I want to combine them into one. Can anyone recommend a good way to do this. I figured copy and paste could do this, but that may be too error-prone. Has anyone done this? How does one take care of overlaps, atom ID, and molecule ID? Is there a program or script for this?

Thank you very much.

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you can use the read_data command multiple times in an input script. you should check the docs for the details

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Thank you very much Jacob.