List of server commands/player
From Vintage Story Wiki
/player [playername] [whitelist|privilege|role|entity|stats|gamemode|landclaimallowance|landclaimmaxareas]
Modify or display player data./player [playername] whitelist
See current whitelist mode of given player./player [playername] whitelist on
Adds a player to a server whitelist./player [playername] privilege
Lists the players current privileges./player [playername] privilege [grant|revoke] [privilegename]
Grants or revokes given privilege for this player./player [playername] role
Shows the players current privilege role. (default: suplayer)/player [playername] role [rolename]
Sets the players current privilege role. (default: suplayer)/player [playername] stats
Shows a summary of the players current privileges./player [playername] gamemode [0..4 or partially/fully written game mode name]
Shows or sets the players current game mode./player [playername] landclaimallowance [0..9999]
Shows or sets a player specific extra land claim allowance, independent of the allowance set by the role. (default: 0)/player [playername] landclaimmaxareas [0..9999]
Shows or sets a player specific extra land claim areas allowance, independent of the allowance set by the role. (default: 0)/player [playername] allowcharselonce
Allows the player to re-select their class after doing so already.