[ZASTRELIS]

Default maps folder needs to be changing for custom for next server. Maybe something like `sm_basepath`?

[Balimbanana]

It depends on what game you are wanting this for, but there should be CVars like mapcyclefile which you can define for each forked server.
In whichever game this is for, on the dedicated server console, use:

find mapcycle

and it should give you a list of related CVars.

[Bacardi]

If cvar is hidden.
Try
sm_cvar mapcyclefile mapcycle2.txt


...unless, you are using cs:go mapgroups without nextmap and mapchooser plugins