haha, first time join a company using Linux, dont even know how to close the file using vi command
just press escape, it will go out of the text and go the last line, then press SHift +semi colon, thenit will appear, then you pressre q +exclamation, then last one, and omost important one, just press enter, then magic will appear.
happy to solve the problem.
also need to take note the OpenFOAM. just type writenow and save file, it will terminate immediately,
iyou can change start now from last time start. then it will start from lasttimestep.
useful vi command
https://www.cs.colostate.edu/helpdocs/vi.html
