Is it possible to run nextcloudcmd to sync only in one direction?
I have two folders:
shared, I want to sync bi-directionally
post, I want to pull from the server and not push any changes to it
Welcome to the forum @howudodat 
nextcloudcmd is a sync client, like every other Nextcloud client and therefore it performs bi-directional sync.
you can run copy files in one direction using WebDAV protocol with your preferred client e.g. rsync, rclone etc…