VM management

# list VMs
qm list
# start/stop
qm start <id>
qm stop <id>

Snapshot management

# list
qm listsnapshot <id>
# create
qm snapshot <id> <snap_name>
# delete 
qm delsnapshot <id> <snap_name>
# rollback to
qm rollback <id> <snap_name>

Guest interaction

# exec qemu guest agent commands
# where <qemu_ga_cmd> is one of:
# fsfreeze-freeze, fsfreeze-status, fsfreeze-thaw, fstrim, 
#   get-fsinfo, get-host-name, get-memory-block-info, 
#   get-memory-blocks, get-osinfo, get-time, get-timezone, 
#   get-users, get-vcpus, info, network-get-interfaces, ping, 
#   shutdown, suspend-disk, suspend-hybrid, suspend-ram
qm guest cmd <id> <qemu_ga_cmd>
# exec arbitrary command in guest
qm guest exec <id> <command>