I am not sure about the documentation but once you login into private cloud using putty and after you enter m2ee command then you can type help which will give you list of available commands as below.
login as: xxxxx
Welcome to m2ee, the Mendix Runtime helper tools.
unpack - unpack an uploaded Mendix Deployment Archive from data/model-upload
download_runtime - download a missing Mendix Runtime distribution
start - try starting the application using the unpacked deployment files
stop - stop the application
restart - restart the application
status - display Mendix Runtime status (is the application running?
create_admin_user - create first user when starting with an empty database
update_admin_user - reset the password of an application user
who, w - show currently logged in users
log - follow live logging from the application
loglevel - view and configure loglevels
about - show Mendix Runtime version information
show_current_runtime_requests - show action stack of current running requests
interrupt_request - cancel a running runtime request
show_license_information - show details about current mendix license key
cleanup_runtimes - clean up downloaded Mendix Runtime versions, except the
one currently in use
cleanup_runtimes_except [<version> <version> ...] - clean up downloaded Mendix
Runtime versions, except the one currently in use and other ones specified
exit, quit, <ctrl>-d - exit m2ee
When using PostgreSQL, you can also use:
psql - start the postgresql shell
dumpdb - create a database dump into the data/database folder
emptydb - drop all tables and sequences from the database
restoredb - restore a database dump from the data/database folder
Hint: use tab autocompletion for commands!
Use help expert to show expert and debugging commands
Hope this helps!