Stop command in midway and restart it.

Try using something like the following.

Replace <commandToRun> with what you actually want to execute and <thisbatchfile> as the name. The ping command is just pinging an address that doesn't exist with a 10 second timeout.

<commandToRun>
ping 123.45.67.89 -n 1 -w 10000 > nul
taskkill /F /IM <commandToRun>
call <thisbatchfile>

This won't work, because the <commandToRun> is a never ending command.

What exactly is a "never ending command"? If you kill the process, it ends it.

You might have viewed my reply before I edited it. Initially I had forgotten the taskkill statement so in that scenario then you would have just had n running instances of the command.

But with the taskkill statement and the /F flag then the process will be killed off